Strange TM 500 plugin to ID
HI All!
Hope this is not inappropriate!? I have a strange TM 500 plug in and I'm guessing that it's a sales aid or a training
aid.? It is a 067-0872-99 Logic Demo Aid.? It has a Tektronix label on the side of it that has a Field Engineers name
on it.? That name is Don Dalton.? That is crossed out with pencil and the name is Dave Mc Cormick (I think) is
written in pencil above it.? Anybody know anything about this, what it was used for, or any interest in it??
Thanks !!
Kim Herron? W8ZV
kim.herron@...
1-616-677-3706
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Re: 7000-series plug-in power tester
On Mon, Jul 6, 2020 at 10:48 AM, C G wrote:
Hope I did not be mislead some fellows out there...
That's what I was trying to avoid. With current 7000 mainframe prices, purchasing and modifying one especially for this purpose is an option as well. Raymond
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Re: 7000-series plug-in power tester
After checking you're absolutely right. Learnt sth today!
In addition, rewiring may be tedious as even power supplies are not the same.
Hope I did not be mislead some fellows out there...
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Le 6 juil. 2020 ¨¤ 09:37, Raymond Domp Frank <hewpatek@...> a ¨¦crit :
On Mon, Jul 6, 2020 at 09:35 AM, C G wrote:
Find a used TM501. Test and/or recap the power supply. Remove the cover to see
properly what's going on inside and you're done!
TM501 - TekWiki < >
Trying to keep this on track: A TM5xx backplane is not a 7000 backplane.
Raymond
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Re: 7000-series plug-in power tester
On Mon, Jul 6, 2020 at 09:35 AM, C G wrote:
Find a used TM501. Test and/or recap the power supply. Remove the cover to see
properly what's going on inside and you're done!
TM501 - TekWiki < >
Trying to keep this on track: A TM5xx backplane is not a 7000 backplane. Raymond
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Re: 7000-series plug-in power tester
Find a used TM501. Test and/or recap the power supply. Remove the cover to see properly what's going on inside and you're done!
TM501 - TekWiki <>
Christian
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Le 6 juil. 2020 ¨¤ 07:46, Dave Seiter <d.seiter@...> a ¨¦crit :
Does a cable extender with a separate power output header specifically for testing count? Built into a dead plugin, the extender cable terminates into the card edge connector, while the power header is fixed on plugin face for stability.
-Dave
On Sunday, July 5, 2020, 07:44:25 PM PDT, stevenhorii <sonodocsch@...> wrote:
Bill,
Thanks - I saw that link and am interested. I'll go back and find it. My
thought was just for powering the plug-ins, but if you're going to do that,
why not use the inputs/outputs also.
Steve H
On Sun, Jul 5, 2020 at 10:41 PM Bill Perkins <sales@...> wrote:
A few weeks back a fellow posted just such a device, intended to
make
7K-series plug-ins outputs available for DSOs.
I don't have a link, sorry
Bill
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick
"smoke" test of plug-in not known to be good. Outside of the mainframe,
you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good
mainframe?
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Re: 7000-series plug-in power tester
Does a cable extender with a separate power output header specifically for testing count?? Built into a dead plugin, the extender cable terminates into the card edge connector, while the power header is fixed on plugin face for stability.
-Dave
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On Sunday, July 5, 2020, 07:44:25 PM PDT, stevenhorii <sonodocsch@...> wrote: Bill, Thanks - I saw that link and am interested. I'll go back and find it. My thought was just for powering the plug-ins, but if you're going to do that, why not use the inputs/outputs also. Steve H On Sun, Jul 5, 2020 at 10:41 PM Bill Perkins <sales@...> wrote:
? ? ? ? A few weeks back a fellow posted just such a device, intended to
make
7K-series plug-ins outputs available for DSOs.
? ? ? ? I don't have a link, sorry
? ? ? ? Bill
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick
"smoke" test of plug-in not known to be good. Outside of the mainframe,
you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good
mainframe?
|
Re: 7000-series plug-in power tester
Bill,
Thanks - I saw that link and am interested. I'll go back and find it. My
thought was just for powering the plug-ins, but if you're going to do that,
why not use the inputs/outputs also.
Steve H
toggle quoted message
Show quoted text
On Sun, Jul 5, 2020 at 10:41 PM Bill Perkins <sales@...> wrote:
A few weeks back a fellow posted just such a device, intended to
make
7K-series plug-ins outputs available for DSOs.
I don't have a link, sorry
Bill
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick
"smoke" test of plug-in not known to be good. Outside of the mainframe,
you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good
mainframe?
|
Re: 7000-series plug-in power tester
A few weeks back a fellow posted just such a device, intended to make 7K-series plug-ins outputs available for DSOs.
I don't have a link, sorry
Bill
toggle quoted message
Show quoted text
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick "smoke" test of plug-in not known to be good. Outside of the mainframe, you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good mainframe?
|
7000-series plug-in power tester
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick "smoke" test of plug-in not known to be good. Outside of the mainframe, you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good mainframe?
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Re: S-52 only works with lowered +15 V power supply
Hi Max,
That must be a relief!
I think the protective function of Q32 is needed immediately after switching the scope to on, when the power supply lines come up (perhaps one after the other). Just a guess, the manual indeed pays no attention to Q32.
Albert
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Re: S-52 only works with lowered +15 V power supply
Hi Albert,
Found the culprit.
The function of Q32 is not explained in the manual. Since you pointed toward Q32 and its "strange" function, just for curiosity I pulled it out.
Result: the pulse output is up and stable with positive supply in the range 13.5 - 15.5 V..
So I returned to the pcb. Q32 has a fixed bias established by R34 ((22k) and R35 (9.1k).
Measuring the two resistors, they give me 19k and 11 k respectively. So the bias point is so altered that with +15 V of positive supply Q32 is almost conducting.
Warming up, Q32 starts to conduct and pulls down the "E" signal...
I think the function of Q32 was to some kind of protection against excessive positive voltages. No other explanations are possible.
Max
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Re: Tek 4041 GPIB Controller
I now have all the latest 4041 System Controller and 4041 DDU service manuals scans available.
Photos of the front page of all three manuals are in the forum photos - just search for 4041 to find my forum photo album.
Send me a PM if you are interested in either of these manuals.
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Re: 2215 CRT problem, PSU filtering?
On Sun, Jun 28, 2020 at 11:22 PM, <Maxsimmonds1337@...> wrote: So, I guess I had better start replacing some caps, the rifa ones looked
cracked, so I'll start with these. The PSU filtering caps, are they all on
A18? Did you find the 0.01uF X2 mains filter cap hidden underneath the mains input socket (on the main PCB)? You have to remove the socket to see it clearly and to replace the cap. Regards, John
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Re: S-52 only works with lowered +15 V power supply
Hi Albert,
thanks for your new photo.
I've added other two photos, which shows clearly that the signal at pin "E" it deads at +15V, and so the TD was killed also.
Measuring the signal on two bases of Q86 and Q88, they are just like you said, with a swing of 1 V approx between ON and OFF state, with same voltage levels you indicated.
I strongly suspect that some carbon resistor are out of tolerances, but it's almost impossible to measure them precisely without pulling them off from the pcb.
Q32 is a strong suspect. I don't have investigated its operation, I will do as soon as possible.
Max
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More Tek Calibrators and 11K spares added to Stuff Day, plus a Tek 2216
I got a few more requests for additional scope calibration items for Tek, so added them today, along with an unusual 4 channel analog/digital Tek 2216. I bet you haven't seen one of THOSE before...
I think I have another 7K frame standardizer too if anybody needs one.
you can see everything at the stuff day page here:
I have a working Tek 2230 and 2430 still to add, and a 2465, all going very cheaply, just takes a while to shoot everything and post it. It was so much easier to just lay it out on shelves for stuff day in the past...
also added a new category on the page, LED stuff, some amazing things in there, left over from my avionics panel design days. should be useful to somebody.
all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
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Re: 7603 HV oscillator doesn¡¯t start up
Hi Christian,
Rollyn is absolutely right about the 2N3055. The original hometaxial process was switched to an epitaxial process. Unfortunately the side effects of this change were not considered important enough to include in the data sheets.
The most significant changes were the increase in Ft - the transition frequency - from 0.8MHz to 2.5MHz and greater risk from secondary breakdown.
I found this out the hard way when a 2N3055 (they were all hometaxial) used in one channel of the Dynaco Stereo 120 Amplifier I built from a kit in 1968 failed. It failed in the mid-1970s and by then the 2N3055s were epitaxial. A few months after I replaced it I noticed the high frequency hiss (noise from the input transistors in the Dynaco PAT-4 preamp) was gone in that channel. At first I thought this was an improvement. When I investigated further the hiss was still there at the output of the power amplifier on both channels. I didn't hear it because the tweeter was blown out. I got the tweeter repaired and a few weeks later the tweeter blew out again.
The gain of the hometaxial 2N3055s began rolling off around 10KHz which was fine for audio amplifiers. Because the Ft of the epitaxial 2N3055 was 3X greater the small inductor Dynaco used at the output of their Stereo 120 to prevent oscillations was no longer sufficient. That was what blew out my tweeters. I only found this out years later.
There is still one more thing and this may be something you need to be aware of: The Wikipedia article on the 2N3055 at
warns against erroneous readings you may get with a multi-meter when checking the gain of the epitaxial versions of the 2N3055. It says: "[Beta] may be 100 to 200 when testing using a multimeter."
Dennis Tillman W7pF
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of ROLYNN PRECHTL K7DFW Sent: Saturday, July 04, 2020 7:49 AM To: [email protected]Subject: Re: [TekScopes] 7603 HV oscillator doesn¡¯t start up It isn't that they were selected, the 2N3055 devices at the time were all homotaxial and had low beta compared to more modern versions. Even with this in play some HV circuits were cranky and wouldn't do well with very low and very high betas. Look for a 150-0140-xx with a beta in the range of approx 20-50. We fought this in the B Phase of the 611 and I'm familiar with the problem. Rolynn Tek Bvtn and Sunset 1966-1971 -- Dennis Tillman W7pF TekScopes Moderator
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Looking for a Tek SC-501 scope part of the TM-500 system
Thank you
Jose Orgnero
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Tek TS-4353/U Distortion Analyzer and 500 series plug-ins
Tom: Just for reference, you might show that I do have a copy of the Tektronix TS-4353/U Distortion Analyzer manual.
I sold a dozen or so of these sets many years ago while owner of DiLette Sales/DiLette.com
I ran that company on my free time from my job as a Boeing 747 Captain for American Airlines (40+ years).
I am now retired in Florida, and no longer active in the technical electronics market.
However, I am somewhat knowledgeable about the TM-504A, which does not seem to be widely understood.
The TM-504A mainframe is quite different from the standard TM-504.
The TS-4353/U was produced for the military to house the AA501/SG505/WQ and SG-505WR plug-ins.
The 100+ page civilian version TS-4353/U manual explains it's functions quite well.
The backplane of the TM-504A was wired specifically to allow crosstalk between these three plug-ins.
I had one customer that modified a standard TM-504, but he continued to have problems to the extent that he later ended up buying a TM-504A case which eliminated his problems. So, my guess is that it was a complicated conversion.
In any event, I have a ton of old Tek hardware and manuals. At 78, I'm not inclined to spend my future scanning docs, but might be willing to help with specific requests.
Capt. R. A. "Dick" Wilson, retired.
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Re: S-52 only works with lowered +15 V power supply
Hi Max,
For comparison I added a photo of the waveform at timing pin E to your album.
Because of both the "+15V" effect and the temperature effect also Q32 might be suspect. As far as I can see Q32 serves only for protection and normally should never conduct. In my unit the base of Q32 is around -4 V with some spikes op to -3.5 V while the emitter is -3 V. When the "+15V" increases the base voltage will also become less negative. When Q32 conducts for some reason timing then pin E is pulled down, causing zeroing the pulse output.
Albert
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Re: 7603 HV oscillator doesn¡¯t start up
It's been fifty years so I don't remember what current setting we used on the 575 to check the Hfe of the 0140's. This had to do with the HV osc in the 611 during B Phase in Plant 2 and Building 50.
My experience with the 7603 is limited to one cranky unit (out of a half dozen here) that I repaired.
I still have my stash of graded 0140's from 1970 and I found that low Beta examples in the 7603 cause a HV failure to start and high Beta examples caused it to take on a life of it's own and do silly things.
RP
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Raymond Domp Frank
Bill Perkins
ROLYNN PRECHTL K7DFW