Re: Interfacing the HP3490A with AR488
Hi Chuck and Dave,
Thank you for your responses. I'm quite a newbie to HP-IB, and I'm learning !
At this time I am able to use the AR488 successfully with a 34401A and a 3457A, in both cases sending instruction codes (to select DCV, ohms, ACV, ranges, etc ...) and receiving measurement results. So far so good.
I did some further reading of the 3490A manual, and table 3-6 on page 3-9 would imply that the 3490A must use two different addresses. For example, it is shipped from the factory with the jumper configuration shown in figure 3-7. This sets an HP-IB address of 66 octal (54 decimal) which is for listening. But this same jumper configuration sets the talk address to 126 octal (86 decimal), which I understand is the address from which the 3490A will talk from, when sending results.
This dual-addressing mode is somewhat puzzling ...
Could anyone with experience of the 3490A on the HP-IB confirm my understanding ?
For me the next step would then be to use this "uncommon" addressing scheme with the AR488.
Thanks to all,
Joel
|
Re: 8753C Sampler Replacement?
I have replaced bad samplers in the past (on HP8753ES instruments).? And yes, when you replace a sampler or a port coupler you do have to run through a calibration proceedure to get everything just right.? The calibration proceedure isn't very intense and can be run in about 30 minutes, but it does require a few insturments (power meters, special cables, etc) to do it.? The power meter requirements vary depending on whether you have a 0-3 GHz or the 6 GHz option, but that might be only on "D" and up that you have to worry about this.
But if you fail to do the calibration then all that really happens is that your baseline response prior to doing a cal is a bit off.? Once you run through a normal 50 ohm cal (which of course you would do prior to any measurement), you are going to get pretty decent results.? So, long story short if you can do the recalibration, great - that's recommended.? If you can't, not ideal, but as long as you do a proper cal prior to making measurements you should be fine.
Depending on where you are at,? one of us might be able to loan you the equiptment needed to do a cal.? It's really not that extensive.
|
As others have said, linear supply pass transistors usually aren't super critical and you can frequently figure out something to replace them with that will be at least as good.? I also look at manuals for similar equipment if I get stuck, as you suggest.
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On 6/23/2024 11:54 AM, george edmonds via groups.io wrote: Hi
To go back to the original topic.
Some time ago I repaired a HP3325B that had suffered a fan failure whilst housed in a rack, this resulted in a seriously damaged power supply from over heating, From memory, which now may not be as good as it was thanks to a Covid infection, the pass transistors were easy to come by as they al had commercial type numbers on them, the only odd thing was the use of heat shrink tubing to make connections to the transistor legs.
Suggest looking at the HP3325B service manual for type numbers for the HP3325A pass transistor type numbers as the power supply is similar.
G Edmonds
On Sunday 23 June 2024 at 16:49:10 BST, Dave McGuire <mcguire@...> wrote:
? At LSSM we use a Czur ET25-Pro for this sort of thing. The guys
doing the scanning say it takes a bit of getting used to, but it
generally does a pretty good job.
? ? ? ? ? ? -Dave
On 6/23/24 11:36, Chuck Harris wrote:
I thought so enough to save mine, and started to scan
them.? To that end I acquired a paper slicer that can
cut the binding off in a single stroke, but the project
stalled, as the paper used is very thin, and doesn't
auto feed well at all.? It got too laborious to have
to go through the scanned books a page at a time to
correct all of the pages that got fed together by the
scanner's feed rollers.
I have been on the lookout for a book scanner that
would allow me to scan the books, manually but accurately,
in their bound state.
If I have to go through it page-by-page, I may as well
be hand flipping the pages.
-Chuck Harris
On Sun, 23 Jun 2024 11:11:06 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
Perhaps these hard copies of data books will be worth their weight in
gold when all the libraries are shut down.? At least worth something
to engineers like us.
On 6/23/2024 11:01 AM, Chuck Harris via groups.io wrote:
On March 26, 2023, a federal judge sided in favor of the four
leading publishers in the US, who sued the Internet Archive for
scanning and lending out numerous digital copies of their
published works.
In April, The internet Archive submitted a final appellate
reply brief fighting the judge's ruling...And the fight goes
on...
I can't help but note that Google does exactly the same thing,
but seems to be inured against legal harm...
-Chuck Harris
On Sun, 23 Jun 2024 10:03:17 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
I went to archive.org, selected "books" then entered "Motorola data
book" and get 16 responses.? 13 are "not in library" and 3 are
available to "borrow" if I log in.
How specifically are you getting to where data books can be
downloaded?
I have shelves of data books.? If I could get searchable pdfs of
them I would give away or recycle the books, which would give me
more space for actual test equipment.
Peter
On 6/23/2024 12:49 AM, tgerbic via groups.io wrote:
Not sure how you are looking these up but I just? go to
archive.org, enter something like "Motorola data book" and I get a
databook I can download in PDF or PDF with OCR.? Searching for
"transistor cross reference" brought up four books that can be
downloaded.? Perhaps it is the way you search for them. --
T. Gerbic
Central California
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Hi
To go back to the original topic.
Some time ago I repaired a HP3325B that had suffered a fan failure whilst housed in a rack, this resulted in a seriously damaged power supply from over heating, From memory, which now may not be as good as it was thanks to a Covid infection, the pass transistors were easy to come by as they al had commercial type numbers on them, the only odd thing was the use of heat shrink tubing to make connections to the transistor legs.
Suggest looking at the HP3325B service manual for type numbers for the HP3325A pass transistor type numbers as the power supply is similar.
G Edmonds
On Sunday 23 June 2024 at 16:49:10 BST, Dave McGuire <mcguire@...> wrote:
? At LSSM we use a Czur ET25-Pro for this sort of thing.? The guys
doing the scanning say it takes a bit of getting used to, but it
generally does a pretty good job.
? ? ? ? ? ? -Dave
On 6/23/24 11:36, Chuck Harris wrote: > I thought so enough to save mine, and started to scan > them.? To that end I acquired a paper slicer that can > cut the binding off in a single stroke, but the project > stalled, as the paper used is very thin, and doesn't > auto feed well at all.? It got too laborious to have > to go through the scanned books a page at a time to > correct all of the pages that got fed together by the > scanner's feed rollers. > > I have been on the lookout for a book scanner that > would allow me to scan the books, manually but accurately, > in their bound state. > > If I have to go through it page-by-page, I may as well > be hand flipping the pages. > > -Chuck Harris > > > On Sun, 23 Jun 2024 11:11:06 -0400 "Peter Gottlieb" > < hpnpilot@...> wrote: >> Perhaps these hard copies of data books will be worth their weight in >> gold when all the libraries are shut down.? At least worth something >> to engineers like us. >> >> >> On 6/23/2024 11:01 AM, Chuck Harris via groups.io wrote: >>> On March 26, 2023, a federal judge sided in favor of the four >>> leading publishers in the US, who sued the Internet Archive for >>> scanning and lending out numerous digital copies of their >>> published works. >>> >>> In April, The internet Archive submitted a final appellate >>> reply brief fighting the judge's ruling...And the fight goes >>> on... >>> >>> I can't help but note that Google does exactly the same thing, >>> but seems to be inured against legal harm... >>> >>> -Chuck Harris >>> >>> >>> On Sun, 23 Jun 2024 10:03:17 -0400 "Peter Gottlieb" >>> < hpnpilot@...> wrote: >>>> I went to archive.org, selected "books" then entered "Motorola data >>>> book" and get 16 responses.? 13 are "not in library" and 3 are >>>> available to "borrow" if I log in. >>>> >>>> How specifically are you getting to where data books can be >>>> downloaded? >>>> >>>> I have shelves of data books.? If I could get searchable pdfs of >>>> them I would give away or recycle the books, which would give me >>>> more space for actual test equipment. >>>> >>>> Peter >>>> >>>> >>>> On 6/23/2024 12:49 AM, tgerbic via groups.io wrote: >>>>> Not sure how you are looking these up but I just? go to >>>>> archive.org, enter something like "Motorola data book" and I get a >>>>> databook I can download in PDF or PDF with OCR.? Searching for >>>>> "transistor cross reference" brought up four books that can be >>>>> downloaded.? Perhaps it is the way you search for them. -- >>>>> T. Gerbic >>>>> Central California >>>>>? ? ? >>>> >>>> >>>> >>>> >>>>? >>> >>> >>> >>> >>>? >> >> >> >> >> >> > > > > > > -- Dave McGuire, AK4HZ New Kensington, PA
|
At LSSM we use a Czur ET25-Pro for this sort of thing. The guys doing the scanning say it takes a bit of getting used to, but it generally does a pretty good job.
-Dave
toggle quoted message
Show quoted text
On 6/23/24 11:36, Chuck Harris wrote: I thought so enough to save mine, and started to scan
them. To that end I acquired a paper slicer that can
cut the binding off in a single stroke, but the project
stalled, as the paper used is very thin, and doesn't
auto feed well at all. It got too laborious to have
to go through the scanned books a page at a time to
correct all of the pages that got fed together by the
scanner's feed rollers.
I have been on the lookout for a book scanner that
would allow me to scan the books, manually but accurately,
in their bound state.
If I have to go through it page-by-page, I may as well
be hand flipping the pages.
-Chuck Harris
On Sun, 23 Jun 2024 11:11:06 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
Perhaps these hard copies of data books will be worth their weight in
gold when all the libraries are shut down.? At least worth something
to engineers like us.
On 6/23/2024 11:01 AM, Chuck Harris via groups.io wrote:
On March 26, 2023, a federal judge sided in favor of the four
leading publishers in the US, who sued the Internet Archive for
scanning and lending out numerous digital copies of their
published works.
In April, The internet Archive submitted a final appellate
reply brief fighting the judge's ruling...And the fight goes
on...
I can't help but note that Google does exactly the same thing,
but seems to be inured against legal harm...
-Chuck Harris
On Sun, 23 Jun 2024 10:03:17 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
I went to archive.org, selected "books" then entered "Motorola data
book" and get 16 responses.? 13 are "not in library" and 3 are
available to "borrow" if I log in.
How specifically are you getting to where data books can be
downloaded?
I have shelves of data books.? If I could get searchable pdfs of
them I would give away or recycle the books, which would give me
more space for actual test equipment.
Peter
On 6/23/2024 12:49 AM, tgerbic via groups.io wrote:
Not sure how you are looking these up but I just? go to
archive.org, enter something like "Motorola data book" and I get a
databook I can download in PDF or PDF with OCR.? Searching for
"transistor cross reference" brought up four books that can be
downloaded.? Perhaps it is the way you search for them. --
T. Gerbic
Central California
--
Dave McGuire, AK4HZ
New Kensington, PA
|
To take this thread even farther off topic, there are plans for such things online. You might also check if an area library has one you could use. On Sun, Jun 23, 2024 at 11:36?AM Chuck Harris via groups.io <cfharris@...> wrote:
I thought so enough to save mine, and started to scan
them. To that end I acquired a paper slicer that can
cut the binding off in a single stroke, but the project
stalled, as the paper used is very thin, and doesn't
auto feed well at all. It got too laborious to have
to go through the scanned books a page at a time to
correct all of the pages that got fed together by the
scanner's feed rollers.
I have been on the lookout for a book scanner that
would allow me to scan the books, manually but accurately,
in their bound state.
If I have to go through it page-by-page, I may as well
be hand flipping the pages.
-Chuck Harris
On Sun, 23 Jun 2024 11:11:06 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
Perhaps these hard copies of data books will be worth their weight in
gold when all the libraries are shut down. At least worth something
to engineers like us.
On 6/23/2024 11:01 AM, Chuck Harris via groups.io wrote:
On March 26, 2023, a federal judge sided in favor of the four
leading publishers in the US, who sued the Internet Archive for
scanning and lending out numerous digital copies of their
published works.
In April, The internet Archive submitted a final appellate
reply brief fighting the judge's ruling...And the fight goes
on...
I can't help but note that Google does exactly the same thing,
but seems to be inured against legal harm...
-Chuck Harris
On Sun, 23 Jun 2024 10:03:17 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
I went to archive.org, selected "books" then entered "Motorola data
book" and get 16 responses. 13 are "not in library" and 3 are
available to "borrow" if I log in.
How specifically are you getting to where data books can be
downloaded?
I have shelves of data books. If I could get searchable pdfs of
them I would give away or recycle the books, which would give me
more space for actual test equipment.
Peter
On 6/23/2024 12:49 AM, tgerbic via groups.io wrote:
Not sure how you are looking these up but I just go to
archive.org, enter something like "Motorola data book" and I get a
databook I can download in PDF or PDF with OCR. Searching for
"transistor cross reference" brought up four books that can be
downloaded. Perhaps it is the way you search for them. --
T. Gerbic
Central California
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|
I thought so enough to save mine, and started to scan them. To that end I acquired a paper slicer that can cut the binding off in a single stroke, but the project stalled, as the paper used is very thin, and doesn't auto feed well at all. It got too laborious to have to go through the scanned books a page at a time to correct all of the pages that got fed together by the scanner's feed rollers. I have been on the lookout for a book scanner that would allow me to scan the books, manually but accurately, in their bound state. If I have to go through it page-by-page, I may as well be hand flipping the pages. -Chuck Harris On Sun, 23 Jun 2024 11:11:06 -0400 "Peter Gottlieb" <hpnpilot@...> wrote: Perhaps these hard copies of data books will be worth their weight in
gold when all the libraries are shut down.? At least worth something
to engineers like us.
On 6/23/2024 11:01 AM, Chuck Harris via groups.io wrote:
On March 26, 2023, a federal judge sided in favor of the four
leading publishers in the US, who sued the Internet Archive for
scanning and lending out numerous digital copies of their
published works.
In April, The internet Archive submitted a final appellate
reply brief fighting the judge's ruling...And the fight goes
on...
I can't help but note that Google does exactly the same thing,
but seems to be inured against legal harm...
-Chuck Harris
On Sun, 23 Jun 2024 10:03:17 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
I went to archive.org, selected "books" then entered "Motorola data
book" and get 16 responses.? 13 are "not in library" and 3 are
available to "borrow" if I log in.
How specifically are you getting to where data books can be
downloaded?
I have shelves of data books.? If I could get searchable pdfs of
them I would give away or recycle the books, which would give me
more space for actual test equipment.
Peter
On 6/23/2024 12:49 AM, tgerbic via groups.io wrote:
Not sure how you are looking these up but I just? go to
archive.org, enter something like "Motorola data book" and I get a
databook I can download in PDF or PDF with OCR.? Searching for
"transistor cross reference" brought up four books that can be
downloaded.? Perhaps it is the way you search for them. --
T. Gerbic
Central California
|
Perhaps these hard copies of data books will be worth their weight in gold when all the libraries are shut down.? At least worth something to engineers like us.
toggle quoted message
Show quoted text
On 6/23/2024 11:01 AM, Chuck Harris via groups.io wrote: On March 26, 2023, a federal judge sided in favor of the four
leading publishers in the US, who sued the Internet Archive for
scanning and lending out numerous digital copies of their
published works.
In April, The internet Archive submitted a final appellate
reply brief fighting the judge's ruling...And the fight goes
on...
I can't help but note that Google does exactly the same thing,
but seems to be inured against legal harm...
-Chuck Harris
On Sun, 23 Jun 2024 10:03:17 -0400 "Peter Gottlieb"
<hpnpilot@...> wrote:
I went to archive.org, selected "books" then entered "Motorola data
book" and get 16 responses.? 13 are "not in library" and 3 are
available to "borrow" if I log in.
How specifically are you getting to where data books can be
downloaded?
I have shelves of data books.? If I could get searchable pdfs of them
I would give away or recycle the books, which would give me more
space for actual test equipment.
Peter
On 6/23/2024 12:49 AM, tgerbic via groups.io wrote:
Not sure how you are looking these up but I just? go to
archive.org, enter something like "Motorola data book" and I get a
databook I can download in PDF or PDF with OCR.? Searching for
"transistor cross reference" brought up four books that can be
downloaded.? Perhaps it is the way you search for them. --
T. Gerbic
Central California
|
On March 26, 2023, a federal judge sided in favor of the four leading publishers in the US, who sued the Internet Archive for scanning and lending out numerous digital copies of their published works. In April, The internet Archive submitted a final appellate reply brief fighting the judge's ruling...And the fight goes on... I can't help but note that Google does exactly the same thing, but seems to be inured against legal harm... -Chuck Harris On Sun, 23 Jun 2024 10:03:17 -0400 "Peter Gottlieb" <hpnpilot@...> wrote: I went to archive.org, selected "books" then entered "Motorola data
book" and get 16 responses.? 13 are "not in library" and 3 are
available to "borrow" if I log in.
How specifically are you getting to where data books can be
downloaded?
I have shelves of data books.? If I could get searchable pdfs of them
I would give away or recycle the books, which would give me more
space for actual test equipment.
Peter
On 6/23/2024 12:49 AM, tgerbic via groups.io wrote:
Not sure how you are looking these up but I just? go to
archive.org, enter something like "Motorola data book" and I get a
databook I can download in PDF or PDF with OCR.? Searching for
"transistor cross reference" brought up four books that can be
downloaded.? Perhaps it is the way you search for them. --
T. Gerbic
Central California
|
I went to archive.org, selected "books" then entered "Motorola data book" and get 16 responses.? 13 are "not in library" and 3 are available to "borrow" if I log in.
How specifically are you getting to where data books can be downloaded?
I have shelves of data books.? If I could get searchable pdfs of them I would give away or recycle the books, which would give me more space for actual test equipment.
Peter
toggle quoted message
Show quoted text
On 6/23/2024 12:49 AM, tgerbic via groups.io wrote: Not sure how you are looking these up but I just? go to archive.org, enter something like "Motorola data book" and I get a databook I can download in PDF or PDF with OCR.? Searching for "transistor cross reference" brought up four books that can be downloaded.? Perhaps it is the way you search for them.
--
T. Gerbic
Central California
|
Not sure how you are looking these up but I just? go to archive.org, enter something like "Motorola data book" and I get a databook I can download in PDF or PDF with OCR.? Searching for "transistor cross reference" brought up four books that can be downloaded.? Perhaps it is the way you search for them.
--
T. Gerbic
Central California
|
Re: HP 400H AC VTVM Difficulties
Good job!
V2 is also important for noise and microphonics, and the electrolytic caps filtering V1 and V2 plate and screen supply.? My tubes were okay but I had to replace the caps even though they read fine for capacitance, leakage, and ESR.
Dave Wise
toggle quoted message
Show quoted text
Greetings to Dave and the Group:
?? I apologize for not getting back to y'all sooner, but other events have intervened.?? I started to post some intermediate results, but my post went off into la-la land and I didn't feel up to re-typing it, so I just waited for all the parts to get here and
then did the shotgun thing.
?? I believe that I have solved the problem.?? So, I will pass along what I did; perhaps it will work for others.?? Also, I will enumerate the booby-trap that caused me to go barking up the wrong tree.
?? The first thing I did was look at the 6CB6 in the V1 position.?? I noted that the whole instrument was highly microphonic, so I chased that for quite a while before I compared the failed and good instruments and decided that the microphonics were characteristic
of the design.?? I swapped V1 for another 6CB6 in the same instrument without affecting the noise or the microphonic behavior, so I went on to other things.?? After replacing all of the large red paper capacitors with modern 630 volt yellow caps from Just
Radios, I discovered that the problem was still there.
?? I then decided to get out a reasonable number of 6CB6 tubes from stock, including another HP branded used tube.?? I then proceeded to try various tubes in the V1 position.?? It turns out that the 6CB6 used in the V1 position must be selected in test for
proper behavior.?? The two HP branded tubes (the original and another used one from stock) exhibited the worst behavior.?? The best behaved tube was a used old-label RCA.?? However, none of them completely cured the intermittent noise spikes.
?? I then bit the bullet and completely rebuilt the range switch... not a task for the faint of heart.?? I used all new yelow film caps and replaced all of the carbon composition resistors with modern film types.?? Only the original HP precision wire-wound
resistors and one Erie tubular ceramic capacitor were left in place.
?? After the range switch rebuild, I again tried tube swapping.?? The HP tubes were as usual... terrible.?? The RCA still exhibited a bit of occasional flicking of the meter needle, but after running the instrument for about 15 minutes, it settled down.?? I
then went back through a couple of my other 6CB6's and found that some which I had decided earlier were still a bit too noisy actually settled down with a fair amount of "burn-in" time.
?? So... the instrument now appears to behave normally so all I have to do now is figure out how to calibrate it.?? The moral of the story is to obtain a half dozen or so 6CB6's and try them one at a time, allowing each to age for at least half an hour.?? If
you can't find a tube that calms the instrument down, and you are certain all the large paper caps in the main chassis are OK, then gird up your loins and re-build the range switch.??
?? The big take-away, however, is that V1 MUST be selected in test from a reasonably sized pool of tubes.
Good Luck
--
Jim Thorusen
KB6GM
|
You did it before the lawsuit ended. On Sat, Jun 22, 2024 at 10:01?PM Michael A. Terrell via groups.io <terrell.michael.a@...> wrote:
I've downloaded over 100 daabooks without a problem. I'd never seen this before today
On Sat, Jun 22, 2024 at 8:59?PM Peter Gottlieb via groups.io <hpnpilot@...> wrote:
Where are these? All I could see are books which can be "borrowed" for an hour
and only read on their secure reader, or downloaded in encrypted form to only be
read on a DRM-compliant reader.
It is literally easier to go to a technical library and look through the books
and compile a list manually into your laptop part by part than use archive.org
to see anything.
On 6/22/2024 3:49 PM, Michael A. Terrell via groups.io wrote:
www.archive.org <> has scans of thousands of old
dtatabooks that you cn dowload as text orPDF. There is also Bitsavers and a
website that scans old databooks and engineering texts.
I'm in my 70s, so I know that I don't have time to cull informationon millions
of parts. The fonts used in older books are not handled well by the scan to
text tools that I've used. Paperport for Windows 95 had the fewest errors, but
it is on a computer with a damaged power connector on the motherboard. I can't
see well enough to do the required repairs. I sit about three innches from a
24" monitor and use an 18 point font in bold to edit the test conversions. I
miss being able to work eight or more hours a day troublesooting and repairing
electronics. I started at 13, in the mid '60s when vacuum tubes were still
commmon.
On Sat, Jun 22, 2024 at 12:07?PM Peter Gottlieb via groups.io
<> <hpnpilot@...> wrote:
I have some older DATA reference books for diodes and transistors which give
basic info for a huge number of parts. I don't know if they ever had an
electronic version before quitting publication.
I would put a little time into this if it were an open source resource which
could help many people.
Peter
On 6/22/2024 7:33 AM, Michael A. Terrell via groups.io <>
wrote:
> I'm consdering putting it up on Github, where others can help me by
offering
> generic numbers they have used. I find some HP parts in the NSN system,
but
> they are being dropped as the government retires models that use them. Many
> have a list of alternate parts, and limited data in the description.
>
> I have a list of some Heathkit parts that were supplied to vocational
> electronics students. The parts accumulated at a local school from students
> that didn't finish the course. It's in HTML It was on my old Earthlink
websiite
>
> On Sat, Jun 22, 2024 at 12:22?AM tgerbic via groups.io
<> <>
> <tgerbic@...> wrote:
>
> Michael,
> Your a real glutton for punishment...
> I started out on a mission to make a parts cross reference for Heathkit
> parts. I started out on my own 40 years ago with a little list
based off
> equipment I owned. I added to it from time to time. A few years ago I
> decided to put some real effort into the most comprehensive cross
> reference list I could make. I pulled all parts lists I could find from
> any source on the web. I searched dozens of repair forums, club
write-ups,
> blogs, test equipment forums, ham radio forums, assembly manuals,
circuit
> descriptions, and keyword searches through several search engines. Got a
> pretty good amount of varied info into a spreadsheet. Next was the
hardest
> part, completing the part substitution work. It is pretty good after a
> couple of years work. But...
>
> I seem to have hit an end point where I just cannot go any further. I
> think you may hit the same thing.
> - Manufacturer part specs that were never scanned and cannot be found on
> the net.
> - Paper specs and databooks that don't seem to exist anywhere.
> - Part numbers that cannot be looked up, or are reused for other parts.
> - Incomplete part numbers that defy guessing the prefixes.
> - Parts that are just common names or simple descriptions (maybe not so
> bad for HP).
> - Then there are parts that do substitute but are unobtainable and a
> second level substitution cannot be found.
>
> I ran into lots of problems with the Heathkit list. I should have
started
> this spreadsheet 30 years ago. It may be easier for some parts of the HP
> list and things like the availability of some info on microfiche will
> help. Heath ran things pretty fast and loose. I think there will
always be
> HP part numbers that don't have enough info to easily match. Close
enough
> may work for a lot of parts. Just having an industry cross, even if not
> available will be helpful. Having been through one experience shows
me the
> value of a comprehensive list and the difficulty of creating one.
>
> It would be good to get others to contribute and spread around the work,
> but I found it is very hard to get anyone interested.
>
> I am currently trying to finish up the Data I/O Unisite family device
> support list (software revisions, footprints, device notes, adapters,
> etc.). A mind numbing amount of work. This may be the last time I take
> on one of these projects.
>
> Good luck on your adventure. It is going to be a lot of work.
>
> --
> T. Gerbic
> Central California
>
>
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|
I've downloaded over 100 daabooks without a? problem. I'd never seen this before today
On Sat, Jun 22, 2024 at 8:59?PM Peter Gottlieb via <hpnpilot= [email protected]> wrote: Where are these?? All I could see are books which can be "borrowed" for an hour
and only read on their secure reader, or downloaded in encrypted form to only be
read on a DRM-compliant reader.
It is literally easier to go to a technical library and look through the books
and compile a list manually into your laptop part by part than use
to see anything.
On 6/22/2024 3:49 PM, Michael A. Terrell via wrote:
> <> has scans of thousands of old
> dtatabooks that you cn dowload as text orPDF. There is also Bitsavers and? a
> website that scans old databooks and engineering texts.
>
> I'm in my 70s, so I know that I don't have time to cull informationon millions
> of parts. The fonts used in older books are not handled well? by the scan to
> text tools that I've used. Paperport for Windows 95 had the fewest errors, but
> it is on a computer with a damaged power connector on the motherboard. I can't
> see well enough to do the required repairs. I sit about three innches from a
> 24" monitor? and use an 18 point font in bold to edit the test conversions. I
> miss being able to work eight or more hours a day troublesooting and repairing
> electronics. I started at 13, in the mid '60s when vacuum tubes were still
> commmon.
>
> On Sat, Jun 22, 2024 at 12:07?PM Peter Gottlieb via
> <> <hpnpilot=[email protected]> wrote:
>
>? ? ?I have some older DATA reference books for diodes and transistors which give
>? ? ?basic info for a huge number of parts.? I don't know if they ever had an
>? ? ?electronic version before quitting publication.
>
>? ? ?I would put a little time into this if it were an open source resource which
>? ? ?could help many people.
>
>? ? ?Peter
>
>
>? ? ?On 6/22/2024 7:33 AM, Michael A. Terrell via <>
>? ? ?wrote:
>? ? ?> I'm consdering putting it up on Github, where others can help me? by
>? ? ?offering
>? ? ?> generic numbers? they have used. I find some HP parts in the NSN system,
>? ? ?but
>? ? ?> they are being dropped as the government retires models that use them. Many
>? ? ?> have a list of alternate parts, and limited data in the description.
>? ? ?>
>? ? ?> I have a list of some Heathkit parts that were supplied to vocational
>? ? ?> electronics students. The parts accumulated at a local school from students
>? ? ?> that didn't finish the course. It's in HTML? It was on my old Earthlink
>? ? ?websiite
>? ? ?>
>? ? ?> On Sat, Jun 22, 2024 at 12:22?AM tgerbic via
>? ? ?<> <>
>? ? ?> <tgerbic=[email protected]> wrote:
>? ? ?>
>? ? ?>? ? ?Michael,
>? ? ?>? ? ?Your a real glutton for punishment...
>? ? ?>? ? ?I started out on a mission to make a parts cross reference for Heathkit
>? ? ?>? ? ?parts.? I started out on my own 40 years ago with a little list
>? ? ?based off
>? ? ?>? ? ?equipment I owned. I added to it from time to time. A few years ago I
>? ? ?>? ? ?decided to put some real effort into the most comprehensive cross
>? ? ?>? ? ?reference list I could make.? I pulled all parts lists I could find from
>? ? ?>? ? ?any source on the web. I searched dozens of repair forums, club
>? ? ?write-ups,
>? ? ?>? ? ?blogs, test equipment forums, ham radio forums, assembly manuals,
>? ? ?circuit
>? ? ?>? ? ?descriptions, and keyword searches through several search engines. Got a
>? ? ?>? ? ?pretty good amount of varied info into a spreadsheet. Next was the
>? ? ?hardest
>? ? ?>? ? ?part, completing the part substitution work. It is pretty good after a
>? ? ?>? ? ?couple of years work. But...
>? ? ?>
>? ? ?>? ? ?I seem to have hit an end point where I just cannot go any further. I
>? ? ?>? ? ?think you may hit the same thing.
>? ? ?>? ? ?- Manufacturer part specs that were never scanned and cannot be found on
>? ? ?>? ? ?the net.
>? ? ?>? ? ?- Paper specs and databooks that don't seem to exist anywhere.
>? ? ?>? ? ?- Part numbers that cannot be looked up, or are reused for other parts.
>? ? ?>? ? ?- Incomplete part numbers that defy guessing the prefixes.
>? ? ?>? ? ?- Parts that are just common names or simple descriptions (maybe not so
>? ? ?>? ? ?bad for HP).
>? ? ?>? ? ?- Then there are parts that do substitute but are unobtainable and a
>? ? ?>? ? ?second level substitution cannot be found.
>? ? ?>
>? ? ?>? ? ?I ran into lots of problems with the Heathkit list. I should have
>? ? ?started
>? ? ?>? ? ?this spreadsheet 30 years ago. It may be easier for some parts of the HP
>? ? ?>? ? ?list and things like the availability of some info on microfiche will
>? ? ?>? ? ?help. Heath ran things pretty fast and loose. I think there will
>? ? ?always be
>? ? ?>? ? ?HP part numbers that don't have enough info to easily match. Close
>? ? ?enough
>? ? ?>? ? ?may work for a lot of parts. Just having an industry cross, even if not
>? ? ?>? ? ?available will be helpful. Having been through one experience shows
>? ? ?me the
>? ? ?>? ? ?value of a comprehensive list and the difficulty of creating one.
>? ? ?>
>? ? ?>? ? ?It would be good to get others to contribute and spread around the work,
>? ? ?>? ? ?but I found it is very hard to get anyone interested.
>? ? ?>
>? ? ?>? ? ?I am currently trying to finish up the Data I/O Unisite family device
>? ? ?>? ? ?support list (software revisions, footprints, device notes, adapters,
>? ? ?>? ? ?etc.).? A mind numbing amount of work.? This may be the last time I take
>? ? ?>? ? ?on one of these projects.
>? ? ?>
>? ? ?>? ? ?Good luck on your adventure. It is going to be a lot of work.
>? ? ?>
>? ? ?>? ? ?--
>? ? ?>? ? ?T. Gerbic
>? ? ?>? ? ?Central California
>? ? ?>
>? ? ?>
>
>
>
>
>
>
>
|
Re: HP 400H AC VTVM Difficulties
Greetings to Dave and the Group:
?? I apologize for not getting back to y'all sooner, but other events have intervened.?? I started to post some intermediate results, but my post went off into la-la land and I didn't feel up to re-typing it, so I just waited for all the parts to get here and then did the shotgun thing.
?? I believe that I have solved the problem.?? So, I will pass along what I did; perhaps it will work for others.?? Also, I will enumerate the booby-trap that caused me to go barking up the wrong tree.
?? The first thing I did was look at the 6CB6 in the V1 position.?? I noted that the whole instrument was highly microphonic, so I chased that for quite a while before I compared the failed and good instruments and decided that the microphonics were characteristic of the design.?? I swapped V1 for another 6CB6 in the same instrument without affecting the noise or the microphonic behavior, so I went on to other things.?? After replacing all of the large red paper capacitors with modern 630 volt yellow caps from Just Radios, I discovered that the problem was still there.
?? I then decided to get out a reasonable number of 6CB6 tubes from stock, including another HP branded used tube.?? I then proceeded to try various tubes in the V1 position.?? It turns out that the 6CB6 used in the V1 position must be selected in test for proper behavior.?? The two HP branded tubes (the original and another used one from stock) exhibited the worst behavior.?? The best behaved tube was a used old-label RCA.?? However, none of them completely cured the intermittent noise spikes.
?? I then bit the bullet and completely rebuilt the range switch... not a task for the faint of heart.?? I used all new yelow film caps and replaced all of the carbon composition resistors with modern film types.?? Only the original HP precision wire-wound resistors and one Erie tubular ceramic capacitor were left in place.
?? After the range switch rebuild, I again tried tube swapping.?? The HP tubes were as usual... terrible.?? The RCA still exhibited a bit of occasional flicking of the meter needle, but after running the instrument for about 15 minutes, it settled down.?? I then went back through a couple of my other 6CB6's and found that some which I had decided earlier were still a bit too noisy actually settled down with a fair amount of "burn-in" time.
?? So... the instrument now appears to behave normally so all I have to do now is figure out how to calibrate it.?? The moral of the story is to obtain a half dozen or so 6CB6's and try them one at a time, allowing each to age for at least half an hour.?? If you can't find a tube that calms the instrument down, and you are certain all the large paper caps in the main chassis are OK, then gird up your loins and re-build the range switch.??
?? The big take-away, however, is that V1 MUST be selected in test from a reasonably sized pool of tubes.
Good Luck
--
Jim Thorusen
KB6GM
|
Where are these?? All I could see are books which can be "borrowed" for an hour and only read on their secure reader, or downloaded in encrypted form to only be read on a DRM-compliant reader.
It is literally easier to go to a technical library and look through the books and compile a list manually into your laptop part by part than use archive.org to see anything.
toggle quoted message
Show quoted text
On 6/22/2024 3:49 PM, Michael A. Terrell via groups.io wrote: www.archive.org <> has scans of thousands of old dtatabooks that you cn dowload as text orPDF. There is also Bitsavers and? a website that scans old databooks and engineering texts.
I'm in my 70s, so I know that I don't have time to cull informationon millions of parts. The fonts used in older books are not handled well? by the scan to text tools that I've used. Paperport for Windows 95 had the fewest errors, but it is on a computer with a damaged power connector on the motherboard. I can't see well enough to do the required repairs. I sit about three innches from a 24" monitor? and use an 18 point font in bold to edit the test conversions. I miss being able to work eight or more hours a day troublesooting and repairing electronics. I started at 13, in the mid '60s when vacuum tubes were still commmon.
On Sat, Jun 22, 2024 at 12:07?PM Peter Gottlieb via groups.io <> <hpnpilot@...> wrote:
I have some older DATA reference books for diodes and transistors which give
basic info for a huge number of parts.? I don't know if they ever had an
electronic version before quitting publication.
I would put a little time into this if it were an open source resource which
could help many people.
Peter
On 6/22/2024 7:33 AM, Michael A. Terrell via groups.io <>
wrote:
> I'm consdering putting it up on Github, where others can help me? by
offering
> generic numbers? they have used. I find some HP parts in the NSN system,
but
> they are being dropped as the government retires models that use them. Many
> have a list of alternate parts, and limited data in the description.
>
> I have a list of some Heathkit parts that were supplied to vocational
> electronics students. The parts accumulated at a local school from students
> that didn't finish the course. It's in HTML? It was on my old Earthlink
websiite
>
> On Sat, Jun 22, 2024 at 12:22?AM tgerbic via groups.io
<> <>
> <tgerbic@...> wrote:
>
>? ? ?Michael,
>? ? ?Your a real glutton for punishment...
>? ? ?I started out on a mission to make a parts cross reference for Heathkit
>? ? ?parts.? I started out on my own 40 years ago with a little list
based off
>? ? ?equipment I owned. I added to it from time to time. A few years ago I
>? ? ?decided to put some real effort into the most comprehensive cross
>? ? ?reference list I could make.? I pulled all parts lists I could find from
>? ? ?any source on the web. I searched dozens of repair forums, club
write-ups,
>? ? ?blogs, test equipment forums, ham radio forums, assembly manuals,
circuit
>? ? ?descriptions, and keyword searches through several search engines. Got a
>? ? ?pretty good amount of varied info into a spreadsheet. Next was the
hardest
>? ? ?part, completing the part substitution work. It is pretty good after a
>? ? ?couple of years work. But...
>
>? ? ?I seem to have hit an end point where I just cannot go any further. I
>? ? ?think you may hit the same thing.
>? ? ?- Manufacturer part specs that were never scanned and cannot be found on
>? ? ?the net.
>? ? ?- Paper specs and databooks that don't seem to exist anywhere.
>? ? ?- Part numbers that cannot be looked up, or are reused for other parts.
>? ? ?- Incomplete part numbers that defy guessing the prefixes.
>? ? ?- Parts that are just common names or simple descriptions (maybe not so
>? ? ?bad for HP).
>? ? ?- Then there are parts that do substitute but are unobtainable and a
>? ? ?second level substitution cannot be found.
>
>? ? ?I ran into lots of problems with the Heathkit list. I should have
started
>? ? ?this spreadsheet 30 years ago. It may be easier for some parts of the HP
>? ? ?list and things like the availability of some info on microfiche will
>? ? ?help. Heath ran things pretty fast and loose. I think there will
always be
>? ? ?HP part numbers that don't have enough info to easily match. Close
enough
>? ? ?may work for a lot of parts. Just having an industry cross, even if not
>? ? ?available will be helpful. Having been through one experience shows
me the
>? ? ?value of a comprehensive list and the difficulty of creating one.
>
>? ? ?It would be good to get others to contribute and spread around the work,
>? ? ?but I found it is very hard to get anyone interested.
>
>? ? ?I am currently trying to finish up the Data I/O Unisite family device
>? ? ?support list (software revisions, footprints, device notes, adapters,
>? ? ?etc.).? A mind numbing amount of work.? This may be the last time I take
>? ? ?on one of these projects.
>
>? ? ?Good luck on your adventure. It is going to be a lot of work.
>
>? ? ?--
>? ? ?T. Gerbic
>? ? ?Central California
>
>
|
8753C Sampler Replacement?
I just picked up an 8753C, and it turns out Port "A" is bad. I verified this by swapping the A5 and A6 cards, and the problem moved to Port "B".?
On the "C" model, is it necessary to calibrate the VNA after replacing one of the sampler cards (mine are all marked 5086-7413 on the sampler)? Or is that only on the "A" and "B" models? The manual seems a bit unclear on this.
Hoping this is "savable" as it's a super clean unit with an LCD upgrade, but I can't justify the cost of a lab calibration, nor do I have nearly the equipment to do so.?
Thanks!?
|
Michael,
I would like to see your list for Heathkit. My Heathkit list might also be useful to look up some of the less exotic part replacements for the HP list.
Peter,
I think I have all the DATA, IC Master, SK, ECG, Philips and Towers generic reference books that have appeared on the web, plus some books in paper form.
I also have hundreds of Motorola, Linear, National, Burr Brown, Dallas, Raytheon, RCA, Ferranti, Harris, etc. scanned data books. Always looking for something new to allow me to find parts to finish my Heathkit list and look up hard to find parts for my uses and for help on forums like this. There are a lot of scanned books/collections out there but not all in one place. There are lots of one or two page replacement/data sheets on the web but not organized in any way either. Google does not index everything so other search engines may be needed to look up hard to find parts.
--
T. Gerbic
Central California
|
archive.org also accepts physical donations: On Sat, Jun 22, 2024 at 3:49?PM Michael A. Terrell via groups.io <terrell.michael.a@...> wrote:
www.archive.org has scans of thousands of old dtatabooks that you cn dowload as text orPDF. There is also Bitsavers and a website that scans old databooks and engineering texts.
I'm in my 70s, so I know that I don't have time to cull informationon millions of parts. The fonts used in older books are not handled well by the scan to text tools that I've used. Paperport for Windows 95 had the fewest errors, but it is on a computer with a damaged power connector on the motherboard. I can't see well enough to do the required repairs. I sit about three innches from a 24" monitor and use an 18 point font in bold to edit the test conversions. I miss being able to work eight or more hours a day troublesooting and repairing electronics. I started at 13, in the mid '60s when vacuum tubes were still commmon.
On Sat, Jun 22, 2024 at 12:07?PM Peter Gottlieb via groups.io <hpnpilot@...> wrote:
I have some older DATA reference books for diodes and transistors which give
basic info for a huge number of parts. I don't know if they ever had an
electronic version before quitting publication.
I would put a little time into this if it were an open source resource which
could help many people.
Peter
On 6/22/2024 7:33 AM, Michael A. Terrell via groups.io wrote:
I'm consdering putting it up on Github, where others can help me by offering
generic numbers they have used. I find some HP parts in the NSN system, but
they are being dropped as the government retires models that use them. Many
have a list of alternate parts, and limited data in the description.
I have a list of some Heathkit parts that were supplied to vocational
electronics students. The parts accumulated at a local school from students
that didn't finish the course. It's in HTML It was on my old Earthlink websiite
On Sat, Jun 22, 2024 at 12:22?AM tgerbic via groups.io <>
<tgerbic@...> wrote:
Michael,
Your a real glutton for punishment...
I started out on a mission to make a parts cross reference for Heathkit
parts. I started out on my own 40 years ago with a little list based off
equipment I owned. I added to it from time to time. A few years ago I
decided to put some real effort into the most comprehensive cross
reference list I could make. I pulled all parts lists I could find from
any source on the web. I searched dozens of repair forums, club write-ups,
blogs, test equipment forums, ham radio forums, assembly manuals, circuit
descriptions, and keyword searches through several search engines. Got a
pretty good amount of varied info into a spreadsheet. Next was the hardest
part, completing the part substitution work. It is pretty good after a
couple of years work. But...
I seem to have hit an end point where I just cannot go any further. I
think you may hit the same thing.
- Manufacturer part specs that were never scanned and cannot be found on
the net.
- Paper specs and databooks that don't seem to exist anywhere.
- Part numbers that cannot be looked up, or are reused for other parts.
- Incomplete part numbers that defy guessing the prefixes.
- Parts that are just common names or simple descriptions (maybe not so
bad for HP).
- Then there are parts that do substitute but are unobtainable and a
second level substitution cannot be found.
I ran into lots of problems with the Heathkit list. I should have started
this spreadsheet 30 years ago. It may be easier for some parts of the HP
list and things like the availability of some info on microfiche will
help. Heath ran things pretty fast and loose. I think there will always be
HP part numbers that don't have enough info to easily match. Close enough
may work for a lot of parts. Just having an industry cross, even if not
available will be helpful. Having been through one experience shows me the
value of a comprehensive list and the difficulty of creating one.
It would be good to get others to contribute and spread around the work,
but I found it is very hard to get anyone interested.
I am currently trying to finish up the Data I/O Unisite family device
support list (software revisions, footprints, device notes, adapters,
etc.). A mind numbing amount of work. This may be the last time I take
on one of these projects.
Good luck on your adventure. It is going to be a lot of work.
--
T. Gerbic
Central California
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has scans of thousands of old dtatabooks that you cn dowload as text orPDF. There is also Bitsavers and? a website that scans old databooks and engineering texts.
I'm in my 70s, so I know that I don't have time to cull informationon millions of parts. The fonts used in older books are not handled well? by the scan to text tools that I've used. Paperport for Windows 95 had the fewest errors, but it is on a computer with a damaged power connector on the motherboard. I can't see well enough to do the required repairs. I sit about three innches from a 24" monitor? and use an 18 point font in bold to edit the test conversions. I miss being able to work eight or more hours a day troublesooting and repairing electronics. I started at 13, in the mid '60s when vacuum tubes were still commmon.
On Sat, Jun 22, 2024 at 12:07?PM Peter Gottlieb via <hpnpilot= [email protected]> wrote: I have some older DATA reference books for diodes and transistors which give
basic info for a huge number of parts.? I don't know if they ever had an
electronic version before quitting publication.
I would put a little time into this if it were an open source resource which
could help many people.
Peter
On 6/22/2024 7:33 AM, Michael A. Terrell via wrote:
> I'm consdering putting it up on Github, where others can help me? by offering
> generic numbers? they have used. I find some HP parts in the NSN system, but
> they are being dropped as the government retires models that use them. Many
> have a list of alternate parts, and limited data in the description.
>
> I have a list of some Heathkit parts that were supplied to vocational
> electronics students. The parts accumulated at a local school from students
> that didn't finish the course. It's in HTML? It was on my old Earthlink websiite
>
> On Sat, Jun 22, 2024 at 12:22?AM tgerbic via <>
> <tgerbic=[email protected]> wrote:
>
>? ? ?Michael,
>? ? ?Your a real glutton for punishment...
>? ? ?I started out on a mission to make a parts cross reference for Heathkit
>? ? ?parts.? I started out on my own 40 years ago with a little list based off
>? ? ?equipment I owned. I added to it from time to time. A few years ago I
>? ? ?decided to put some real effort into the most comprehensive cross
>? ? ?reference list I could make.? I pulled all parts lists I could find from
>? ? ?any source on the web. I searched dozens of repair forums, club write-ups,
>? ? ?blogs, test equipment forums, ham radio forums, assembly manuals, circuit
>? ? ?descriptions, and keyword searches through several search engines. Got a
>? ? ?pretty good amount of varied info into a spreadsheet. Next was the hardest
>? ? ?part, completing the part substitution work. It is pretty good after a
>? ? ?couple of years work. But...
>
>? ? ?I seem to have hit an end point where I just cannot go any further. I
>? ? ?think you may hit the same thing.
>? ? ?- Manufacturer part specs that were never scanned and cannot be found on
>? ? ?the net.
>? ? ?- Paper specs and databooks that don't seem to exist anywhere.
>? ? ?- Part numbers that cannot be looked up, or are reused for other parts.
>? ? ?- Incomplete part numbers that defy guessing the prefixes.
>? ? ?- Parts that are just common names or simple descriptions (maybe not so
>? ? ?bad for HP).
>? ? ?- Then there are parts that do substitute but are unobtainable and a
>? ? ?second level substitution cannot be found.
>
>? ? ?I ran into lots of problems with the Heathkit list.? I should have started
>? ? ?this spreadsheet 30 years ago. It may be easier for some parts of the HP
>? ? ?list and things like the availability of some info on microfiche will
>? ? ?help. Heath ran things pretty fast and loose. I think there will always be
>? ? ?HP part numbers that don't have enough info to easily match. Close enough
>? ? ?may work for a lot of parts. Just having an industry cross, even if not
>? ? ?available will be helpful. Having been through one experience shows me the
>? ? ?value of a comprehensive list and the difficulty of creating one.
>
>? ? ?It would be good to get others to contribute and spread around the work,
>? ? ?but I found it is very hard to get anyone interested.
>
>? ? ?I am currently trying to finish up the Data I/O Unisite family device
>? ? ?support list (software revisions, footprints, device notes, adapters,
>? ? ?etc.).? A mind numbing amount of work.? This may be the last time I take
>? ? ?on one of these projects.
>
>? ? ?Good luck on your adventure. It is going to be a lot of work.
>
>? ? ?--
>? ? ?T. Gerbic
>? ? ?Central California
>
>
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Dave McGuire
Michael A. Terrell