Re: WTD: Filter capacitors for 8662A PSU
You Could try this. Still fine and working since I re-built the unit back in 2012.  Regards Gerald VK3GJM
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Hi From memory it is only a low frequency counter that go for about ?120 is it worth re-engineering ? ? Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Jim Ford
Sent: 20 February 2022 22:56
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed? Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH. Sent from my T-Mobile 4G LTE Device -------- Original message -------- Date: 2/20/22 2:21 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument.
Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal.
Pure unobtainum, I'm afraid ...
Joel Setton
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Re: WTD: Filter capacitors for 8662A PSU
Hi Bob,
I long ago gave up trying to find replacement electro caps that are both electrically and physically compatible. Modern ones tend to be quite a bit smaller, so I just either make an adapter board to accommodate the different sizes, or stuff the new ones into the old cans.
If you have no luck finding compatible caps, those might be options to consider.
Cheers Tom Sent from my iThing; please forgive the typos and brevity
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On Feb 20, 2022, at 14:45, Bob Weiss <bobweiss1967@...> wrote:
?Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.
The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835
I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.
Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?
73,
Bob Weiss N2IXK
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Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH.
Jim Ford
Sent from my T-Mobile 4G LTE Device
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-------- Original message -------- From: Joel Setton <setton@...> Date: 2/20/22 2:21 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed
The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument. Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal. Pure unobtainum, I'm afraid ... Joel Setton
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WTD: Filter capacitors for 8662A PSU
Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.
The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835
I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.
Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?
73,
Bob Weiss N2IXK
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Re: AM modulated sine wave - Q about oscilloscope triggering
You could also use a detector and a low pass filter feeding the trigger input. That's the way we would trigger the scope on amplitude modulated modulated signals from the amplitude modulated modulated transmitters when I was an amplitude modulated modulated radio station engineer. There is more than one way to skin a cat cat ?
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Re: Mixing 'n' matching S parameter test sets
Thanks, John. I was hoping that was what you’d meant. ?
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From: [email protected] <[email protected]> On Behalf Of John Lyles
Sent: Sunday, February 20, 2022 12:36 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Mixing 'n' matching S parameter test sets? S parameters, as you know, can be characterized by S11, S21, S12 and S22. The two port test sets have enough directional couplers and power splitters inside to measure all four, by switching the direction of the RF feed, if directed to do all four measurements by the VNA controller. However, the 8754A was built long before that became a necessity for fast bench measurements. There are still just two ports on the test set, I am sorry if I confused the topic. I meant four S parameters being measured.
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Re: Looking for power supply schematic of Agilent 83751A
On Sun, Feb 20, 2022 at 10:46 PM Dave McGuire <mcguire@...> wrote:
I've seen plenty of capacitors fail shorted, but never an
electrolytic, I guess I've been lucky there.
I've seen exactly 2 aluminium electrolytics failed short circuit so far in maybe 20 years of repairs, both were inside HP instruments: one into a HP-3456A ad one was in a HP-5328A They were enough dead short to pop fuses and blow one pass transistor in the case of the 5328A. Just for the record anyway Frank
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Re: Looking for power supply schematic of Agilent 83751A
Failing shorted is indeed unusual for these caps. Of the few that I've seen, a good fraction had actually been installed backwards at the factory. Even HP occasionally makes that error, surprisingly enough. The 8657A that I own had failed because of that.
-- Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 2/20/2022 13:46, Dave McGuire wrote:
? I've seen plenty of capacitors fail shorted, but never an electrolytic, I guess I've been lucky there.
? What I HAVE seen them do is "almost" short, like 100 ohms or so, boil their electrolyte and blow the wad out the end like a party streamer.
? A very stinky party streamer. ;)
?????????? -Dave
On 2/20/22 15:51, Glydeck via groups.io wrote:
I’ve seen caps fail short and with spectacular results.
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Glydeck
On Feb 20, 2022, at 6:39 AM, Dave McGuire <mcguire@...> wrote:
?On 2/20/22 01:28, Lincheng Xiu via groups.io wrote:
After 6 hours troubleshooting, it is fixed. The reason is C35 short. 100uF/50V electrolytic capacitor.
Here is what I traced the partial schematic of HP83751A power supply.
?After C35 short, the PWM controller does not drive the MOSFETs.
Also checked the ESR of C1, which is too much, 2 ohm, it will soon fail, just replaced with a new one. ?Wow, I see electrolytic capacitors like that dry out and lose capacitance all the time, but I don't think I've ever seen one shorted. Nice troubleshooting!
?????????-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: Looking for power supply schematic of Agilent 83751A
I've seen plenty of capacitors fail shorted, but never an electrolytic, I guess I've been lucky there.
What I HAVE seen them do is "almost" short, like 100 ohms or so, boil their electrolyte and blow the wad out the end like a party streamer.
A very stinky party streamer. ;)
-Dave
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On 2/20/22 15:51, Glydeck via groups.io wrote: I’ve seen caps fail short and with spectacular results.
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Glydeck
On Feb 20, 2022, at 6:39 AM, Dave McGuire <mcguire@...> wrote:
?On 2/20/22 01:28, Lincheng Xiu via groups.io wrote:
After 6 hours troubleshooting, it is fixed. The reason is C35 short. 100uF/50V electrolytic capacitor.
Here is what I traced the partial schematic of HP83751A power supply.
?After C35 short, the PWM controller does not drive the MOSFETs.
Also checked the ESR of C1, which is too much, 2 ohm, it will soon fail, just replaced with a new one. ?Wow, I see electrolytic capacitors like that dry out and lose capacitance all the time, but I don't think I've ever seen one shorted. Nice troubleshooting!
?????????-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: HP8903B - THD measure on Phono RIAA preamplifier
Hi Chris,
yes, I have reduced the input to the phono preamp so as to have the output signal not clipped in the whole band from 20 Hz to 20 kHz (seen on oscilloscope).
With my friends we have made several phono preamps both tube and solid state. No problem with solid state preamps (fet or low noise opamps), while with tube ones they are fine, but it is very difficult to eliminate the hum at the mains frequency (50 Hz) that is heard especially when the turntable arm is raised from the vinile disc.
-- Cheers
? ? Attilio
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Re: Looking for power supply schematic of Agilent 83751A
I’ve seen caps fail short and with spectacular results.?
?
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On Feb 20, 2022, at 6:39 AM, Dave McGuire <mcguire@...> wrote:
? On 2/20/22 01:28, Lincheng Xiu via groups.io wrote:After 6 hours troubleshooting, it is fixed. The reason is C35 short. 100uF/50V electrolytic capacitor.
Here is what I traced the partial schematic of HP83751A power supply.
?After C35 short, the PWM controller does not drive the MOSFETs.
Also checked the ESR of C1, which is too much, 2 ohm, it will soon fail, just replaced with a new one.
?Wow, I see electrolytic capacitors like that dry out and lose capacitance all the time, but I don't think I've ever seen one shorted. Nice troubleshooting! ?????????-Dave-- Dave McGuire, AK4HZNew Kensington, PA
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Re: HP8903B - THD measure on Phono RIAA preamplifier
Hi?Attilio,
Make certain your test signal doesn't exceed 5 mV (as a number) or you may drive the phono preamp beyond it's linear range (a lot lower than clipping).? That will drive distortion numbers up.? Also, a tube stage has much lower transconductance than solid state designs, so you will have much higher distortion figures as you have much lower feedback than a line stage will have, even lower in the lower frequencies.? So do not expect very low distortion figures from (especially) simple phono gain stages.? Tubes also are inherently more noisy than a solid state stage given the same care in design.? I design with tubes, transistors and ICs and you have to match your expectations to the technology you are using.? With tubes, power supply noise is critical as well.
I used an HP 339A with the output to a 3585A, and also a ShibaSuko AD725C.? The new audio analysers are more than a magnitude better, but you do what you can.? You may find that a really good sound card can enhance your capabilities, but they do not tolerate input voltages over 5 Vpk? max.? That's a problem with tube stages and also solid state, so you need to condition and limit the input.? Calibrating this isn't too hard.
-Chris
The 8903B is a fine analyser within it's limitations.? I wish I could afford either of the two current audio analysers, but like you I can't.
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Re: HP65 software and memory strips?
I wasn't so much scolding you about being OT, as pointing out that you may get more interest on other mailing lists.
-Dave
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On 2/20/22 14:26, Tony wrote: Hi Dave,
Apologies - didn’t mean to post OT.
I’ll take it off line from now on.
T.
On Sun, 20 Feb 2022 at 19:14, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
On 2/20/22 13:33, Tony wrote:
> While sorting through packing material to dispose of I found a
package
> that came with my HP85 but which I not noticed.
>
> I had to do some research but realised it contains a big
collection of
> HP65 calculator programmable strips and some HP software pacs. See
> attached pics.
>
> I was wondering if these strips are still readable after many years?
>
> I have no use for them but also have no idea if there is any
interest in
> these sorts of items now?
>
> There is also something that looks like a battery pac charger -
it has
> an electrical connector on the bottom. But no idea what it is for.
? ?This really isn't the right place for it, but HP calculators and
early computers have a HUGE following.
? ? ? ? ? ? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
--
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: HP65 software and memory strips?
Yes, that is the charger for the early HP calculators, including the models 35, 45, 55, 65, 67, 70, 80.
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On Feb 20, 2022, at 13:24, Mark Bielman <mbielman@...> wrote:
?
If I remember correctly, the HP75 uses the same battery pack.
Mark
It is possible that the cards are still readable and even if they are not they can probably be re-written if you go over to MoHPC
? I am sure you would find someone interested The battery charger is an external charger for the battery pack that the HP-65 used among others.
Paul.
On 2022-02-20 14:33, Tony wrote:
Hi,
While sorting through packing material to dispose of I found a package that came with my HP85 but which I not noticed.
I had to do some research but realised it contains a big collection of HP65 calculator programmable strips and some HP software pacs. See attached pics.
I was wondering if these strips are still readable after many years?
I have no use for them but also have no idea if there is any interest in these sorts of items now?
There is also something that looks like a battery pac charger - it has an electrical connector on the bottom. But no idea what it is for.
thanks
Tony
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Re: HP65 software and memory strips?
Hi Dave,
Apologies - didn’t mean to post OT.
I’ll take it off line from now on.
T.
On Sun, 20 Feb 2022 at 19:14, Dave McGuire < mcguire@...> wrote: On 2/20/22 13:33, Tony wrote:
> While sorting through packing material to dispose of I found a package
> that came with my HP85 but which I not noticed.
>
> I had to do some research but realised it contains a big collection of
> HP65 calculator programmable strips and some HP software pacs. See
> attached pics.
>
> I was wondering if these strips are still readable after many years?
>
> I have no use for them but also have no idea if there is any interest in
> these sorts of items now?
>
> There is also something that looks like a battery pac charger - it has
> an electrical connector on the bottom. But no idea what it is for.
? ?This really isn't the right place for it, but HP calculators and
early computers have a HUGE following.
? ? ? ? ? ? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: HP65 software and memory strips?
If I remember correctly, the HP75 uses the same battery pack.
Mark
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Show quoted text
It is possible that the cards are still readable and even if they are not they can probably be re-written if you go over to MoHPC
? I am sure you would find someone interested The battery charger is an external charger for the battery pack that the HP-65 used among others.
Paul.
On 2022-02-20 14:33, Tony wrote:
Hi,
While sorting through packing material to dispose of I found a package that came with my HP85 but which I not noticed.
I had to do some research but realised it contains a big collection of HP65 calculator programmable strips and some HP software pacs. See attached pics.
I was wondering if these strips are still readable after many years?
I have no use for them but also have no idea if there is any interest in these sorts of items now?
There is also something that looks like a battery pac charger - it has an electrical connector on the bottom. But no idea what it is for.
thanks
Tony
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Re: HP-8753E Options Activated
Well done Rich.
Sounds like you have confirmed that 8753D and 8753E have the same EEPROM layout after all.
I did some service guide digging this morning and found some indications that they could be the same.
Br
Marcus
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Re: HP65 software and memory strips?
It is possible that the cards are still readable and even if they
are not they can probably be re-written if you go over to MoHPC
? I am sure you would find someone interested The
battery charger is an external charger for the battery pack that
the HP-65 used among others.
Paul.
On 2022-02-20 14:33, Tony wrote:
toggle quoted message
Show quoted text
Hi,
While sorting through packing material to dispose of I found a
package that came with my HP85 but which I not noticed.
I had to do some research but realised it contains a big
collection of HP65 calculator programmable strips and some HP
software pacs. See attached pics.
I was wondering if these strips are still readable after many
years?
I have no use for them but also have no idea if there is any
interest in these sorts of items now?
There is also something that looks like a battery pac charger -
it has an electrical connector on the bottom. But no idea what
it is for.
thanks
Tony
|
Re: HP65 software and memory strips?
On 2/20/22 13:33, Tony wrote: While sorting through packing material to dispose of I found a package that came with my HP85 but which I not noticed.
I had to do some research but realised it contains a big collection of HP65 calculator programmable strips and some HP software pacs. See attached pics.
I was wondering if these strips are still readable after many years?
I have no use for them but also have no idea if there is any interest in these sorts of items now?
There is also something that looks like a battery pac charger - it has an electrical connector on the bottom. But no idea what it is for. This really isn't the right place for it, but HP calculators and early computers have a HUGE following. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Paul Bicknell
Dave McGuire
Attilio
Glydeck