Sam Zeloof made some negative resistance tunnel diodes. I wonder if his
approach could ever be refined to where we can make our own sampler diodes.
See below for curve tracer plots.
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Re: S- series sampling head connectors
Yes that coax connector is an SMB. The pitch on the connectors is .156" (matching socket in 7S11 or 7S12 was Viking 000-201-2901)
Dave
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of cmjones01 Sent: 13 July 2018 22:17 To: [email protected]Subject: [TekScopes] S- series sampling head connectors Does anyone know the pitch of the edge connector on the back of S-series sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap ones to play with and would like to make a custom cable for them. I can't tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch. I'm hoping it's the latter because I've got lots of those. There's a coax connector by the side which looks kind of like an SMB - is it? Thank you Chris
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Re: Low cost Scope-Mobile alternatives?
Al,
Where do you live? I have a Tek Scope cart I need to rehome, in the Pacific North Wet
Bill Higdon (willard561 at aol.c0m)
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Re: S- series sampling head connectors
On Fri, 13 Jul 2018 14:17:02 -0700, you wrote: Does anyone know the pitch of the edge connector on the back of S-series sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap ones to play with and would like to make a custom cable for them. I can't tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch. I'm hoping it's the latter because I've got lots of those. Go for 0.156. At that time, 0.1 or .156 would have been the only ones. My digital calipers say 0.156. Harvey
There's a coax connector by the side which looks kind of like an SMB - is it?
Thank you
Chris
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Re: OT (but maybe useful info) Recall on Harbor Freight automotive fuses
On Fri, 13 Jul 2018 09:24:41 -0700, you wrote: One of my cheapo HF miter saws crapped out recently, apparently from the main switch burning up. I went to their support website to see if I could find a new switch versus replacing the whole thing, and stumbled upon this unrelated recall notice:
I bought a couple of these sets years ago, and don't recall if or where I may have used some of these fuses, and am a bit worried. Thought I'd mention it here in case anyone has done the same. OK, the automotive fuses are rated at 32 volts maximum (typical) and are NOT made for interrupting 120 or 240 volts.
It turned out that they didn't have the switches anymore, and it's a good thing. I ended up just getting a fresh saw on sale and with my 20% off coupon, and later found that the motor in the old saw had burned out, which is what caused the switch to burn up. If I had found a new switch, it would have been a waste. No regrets though, since I got a lot of use out of the old beast over several years, and worked it very hard lots of times.
I have an HF wet/dry grinder (the one with the vertical mount slow wheel that is suspended within a tank of water). The switch failed. It is rather nice for grinding off the little tabs left over from a popular PC board house, the water keeps the fiberglass dust from getting out into the shop. Harvey
Ed
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Re: S- series sampling head connectors
Yes they did 3 ft and 6ft. Plus for the s3000 family they made them in
lengths required to get from the 568 to the test drawer.
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On Fri, Jul 13, 2018, 2:57 PM Dave Daniel <kc0wjn@...> wrote: I'm pretty sure that Tektronix also offered an extension cable that
consisted of a plug-in unit with a cable with a connector at the end
that plugged into any of the sampling heads.
I could that that, but my extension module is somewhere in a box either
in my house on on a truck headed my way.
DaveD
On 7/13/2018 5:52 PM, Pete Lancashire wrote:
If you run out of S1s I will soon have about 20 dead S1 & S2s as part of my
s3110 restoration project.
I forget the picture of the connector but it is a standard Edge connector
the only thing Tek did was to use a hire gold thickness than a normal
connector. There is nothing special about the interconnect the cable tech
made was custom because it was cheap for them to do it but the only thing
custom is the embedded coax. I'm sure it's just a piece of rg174 woodwork.
On Fri, Jul 13, 2018, 2:17 PM cmjones01 <chris@...> wrote:
Does anyone know the pitch of the edge connector on the back of S-series
sampling heads, like the S-1 and S-2? I've just ordered a couple of
cheap
ones to play with and would like to make a custom cable for them. I
can't
tell from the photos whether the connector is 0.1", 0.15" or 0.156"
pitch.
I'm hoping it's the latter because I've got lots of those.
There's a coax connector by the side which looks kind of like an SMB -
is
it?
Thank you
Chris
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Re: S- series sampling head connectors
I'm pretty sure that Tektronix also offered an extension cable that consisted of a plug-in unit with a cable with a connector at the end that plugged into any of the sampling heads.
I could that that, but my extension module is somewhere in a box either in my house on on a truck headed my way.
DaveD
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Show quoted text
On 7/13/2018 5:52 PM, Pete Lancashire wrote: If you run out of S1s I will soon have about 20 dead S1 & S2s as part of my
s3110 restoration project.
I forget the picture of the connector but it is a standard Edge connector
the only thing Tek did was to use a hire gold thickness than a normal
connector. There is nothing special about the interconnect the cable tech
made was custom because it was cheap for them to do it but the only thing
custom is the embedded coax. I'm sure it's just a piece of rg174 woodwork.
On Fri, Jul 13, 2018, 2:17 PM cmjones01 <chris@...> wrote:
Does anyone know the pitch of the edge connector on the back of S-series
sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap
ones to play with and would like to make a custom cable for them. I can't
tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch.
I'm hoping it's the latter because I've got lots of those.
There's a coax connector by the side which looks kind of like an SMB - is
it?
Thank you
Chris
|
Re: S- series sampling head connectors
If you run out of S1s I will soon have about 20 dead S1 & S2s as part of my
s3110 restoration project.
I forget the picture of the connector but it is a standard Edge connector
the only thing Tek did was to use a hire gold thickness than a normal
connector. There is nothing special about the interconnect the cable tech
made was custom because it was cheap for them to do it but the only thing
custom is the embedded coax. I'm sure it's just a piece of rg174 woodwork.
toggle quoted message
Show quoted text
On Fri, Jul 13, 2018, 2:17 PM cmjones01 <chris@...> wrote: Does anyone know the pitch of the edge connector on the back of S-series
sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap
ones to play with and would like to make a custom cable for them. I can't
tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch.
I'm hoping it's the latter because I've got lots of those.
There's a coax connector by the side which looks kind of like an SMB - is
it?
Thank you
Chris
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Re: Tek 465B blurred channel 1 trace
I am posting an update as I am back on to trying to fix my 465B.
I thought a working scope would help me troubleshoot a intermittent problem but I ended up not needing one.
I changed out the smoothing caps and all my voltages are now within spec and ripple is hard to detect.
Since my problem was intermittent I may have let myself be lead down the wrong path, very embarrassing. I had no trace, I pulled the W4032 jumper (HV Mult GND) and my trace came back. This lead me to believe the HV multiplier was bad. I swapped it out and my trace came back. I turned off the scope because I forgot to put the cover back on the hv multiplier and needed to remove the vert preamp board to do so. Once I got it all back together I had no trace and no -8v. Every time I had measured previously I had -8v but I am worried I changed out the HV multiplier without needing to do so.
Moving forward and using isolation, I determined the vertical output board was the culprit. I couldn't find any bad components so I re-seated all the transistors and the CRT vertical deflection driver and Voila! I had my traces back and cleaner than ever. I still have a problem with distorted square waves but fuzziness is gone.
I need to test my old HV multiplier to see if it is good or bad. Maybe I just bumped something on the Vert Ouput board when I was removing the CRT. Or perhaps this was the problem all along.
I need to figure out why square waves are so bad on both channels. it looks like excessive ringing.
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S- series sampling head connectors
Does anyone know the pitch of the edge connector on the back of S-series sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap ones to play with and would like to make a custom cable for them. I can't tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch. I'm hoping it's the latter because I've got lots of those.
There's a coax connector by the side which looks kind of like an SMB - is it?
Thank you
Chris
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Re: 2215 avoiding future CRT damage
Is there an index of titles?
Not in the microfiche that I'm aware of. If an instrument had a SUP, not the same a common mods, it is included in the microfiche section concerning that specific instrument. /H?kan
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Re: 2465B Blue Screen Filter - 378-0270-00
On Fri, 13 Jul 2018, k4ifg via Groups.Io wrote: Here comes that infamous "Me too" moment :) I would also purchase one if they are still available. ksi at koi8 dot net for off-list contact. Thanks in advance, Sergey. Victor Silva
I would be interested in obtaining three (3) of the blue screen filter if available.
Contact off group - k4ifg at yahoo
Thanks
--- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *
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Problem posted originally under #149304
What looked like dot-pattern on the horizontal trace(s), on closer inspection due to superimposed X-plate HF signal which gives velocity modulation of the spot.
This is a 234V model and we live in a relatively rural area with plenty of PV installations. Anyway, after much hunting around and decoupling of various supplies, it did turn out to be intereferance on the incoming mains. It is more-or-less cured by adding a 0.68uF class X capacitor across the primary of T702. Only when T701 is in the +/- straight-through position is the problem still visible, albeit diminished.
John
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OT (but maybe useful info) Recall on Harbor Freight automotive fuses
One of my cheapo HF miter saws crapped out recently, apparently from the main switch burning up. I went to their support website to see if I could find a new switch versus replacing the whole thing, and stumbled upon this unrelated recall notice:
I bought a couple of these sets years ago, and don't recall if or where I may have used some of these fuses, and am a bit worried. Thought I'd mention it here in case anyone has done the same.
It turned out that they didn't have the switches anymore, and it's a good thing. I ended up just getting a fresh saw on sale and with my 20% off coupon, and later found that the motor in the old saw had burned out, which is what caused the switch to burn up. If I had found a new switch, it would have been a waste. No regrets though, since I got a lot of use out of the old beast over several years, and worked it very hard lots of times.
Ed
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Re: 2465B Blue Screen Filter - 378-0270-00
Victor Silva
I would be interested in obtaining three (3) of the blue screen filter if available.
Contact off group - k4ifg at yahoo
Thanks
|
Re: 2215 avoiding future CRT damage
H?kan,
I'm not looking for anything specific, just looking to have them more publicly available, findable (Google / Bing), and searchable. My preferred route would either be to archive some sort of machine readable copies at or, as some documents already are, linked through to your website.
Is there an index of titles?
Regards, Brian.
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Re: Pass the word - vintagTEK instrument loans for students
I just received this from Dave Brown at the vintageTEK Museum:
Today the vintageTEK museum announced the official launch of their instrument library. This is an
opportunity for students, age 10 and older, to check out instruments on loan for their personal
projects and education. That sounds like an excellent initiative. Particularly the 465, 475 and (gasp) 485 - a very capable scope, which I would like to have in my Tek stable myself. Let's hope it helps fire up young enthusiasm for engineering, electronics and physics. I started out with a monster boatanchor called a Hartley 13A (like this one ) , which were released onto the market in the late 60's/ very early 70's as military surplus. Must have bought mine age about 14. And yes - that was a formative purchase for sure. And was an upper body workout just to move it. Craig
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TEK AFG3021B - dispaly diminishing
Hello All
Display (Contrast) gradually starts diminishing( about 1 hour) after power on .and display becomes blank.
Backlit display ok.
Regards
Anand
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Pass the word - vintagTEK instrument loans for students
I just received this from Dave Brown at the vintageTEK Museum:
Today the vintageTEK museum announced the official launch of their
instrument library. This is an opportunity for students, age 10 and older,
to check out instruments on loan for their personal projects and education.
Museum volunteers have worked hard to restore a number of products to make
available on loan. Products include oscilloscopes, counters, function
generators, and power supplies. Other products will be added in the future
as they become available.
Many engineers will tell you the story of how they got "hooked" on
technology, and the stories typically start with some project or product
tear-down at an early age. This is a way for the museum to encourage these
early educational opportunities with the loan of some fairly sophisticated
electronic projects. Please see our
<> Instrument Library page for
more details.
David J. Brown
vintageTEK President
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Re: 2465B Blue Screen Filter - 378-0270-00
Victor Silva please write me off line regarding blue filters.
reed714@...
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On 7/12/2018 8:02 AM, victor.silva via Groups.Io wrote: Hi Tom,
Your memory serves you correctly. The cast blue acrylic that is 0.030" thick is very difficult to find.
I did buy a special order at a very high cost (>$1000) and then sold off pre-made filters to recoup my cost of the raw material.
The remaining dwindling stock I use for my own refurbished scopes that I sell.
When someone sells filters on ebay I usually order one just to see what someone else has done.
The filters from Australia are thicker that the original Tek 0.030" and will not float in the bezel.
So they need to be taped into the bezel because they will not work with the spring.
In addition the very tight horizontal dimensions are not maintained - so again the need to tape the filter in place since it will not fit in the bezel properly.
I would be willing to sell a filter to groups members through epay for around $15.
--Victor
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David C. Partridge
Timothy
zenith5106
Sergey Kubushyn
John Sykes
Brian Cockburn