Re: Recreating an old board for the 7854
Awesome that would be great. I am kind of out of my depth on this one. The connectors on the board are Large connector in the front of the scope - AMP 3-530662-0-8301 Small connector towards the back
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Zentronics42@...
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#184936
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Re: 5642 rectifier tubes in a Tek 535: Replace or swap for silicone?
Well, I am glad someone said it. All day I was wondering about diode implants.... Jeff KruthIn a message dated 7/27/2021 7:19:21 PM Eastern Standard Time, rickc@... writes:?Dom, Diodes are
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Jeff Kruth
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#184935
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Re: TM5xx extenders
Ke-Fong Line wrote: No problem, I entirely missed the post as well when I was doing research for building my own TM500 prototyping boards a few months ago. Oddly, now that I have had the chance to
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Jeff Dutky
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#184934
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Re: 7000 test/cal module(s) and backplane breakout board.
Simple mistake on the prototype wiring was the cause of the poor TS pulse detection previously reported. Here is what it should look like:
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Andy Warner
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#184933
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Re: Tek Scopes found in old picture book
You might be talking about the loose tube in a box at the bottom of the picture. I mean a rack mounted unit between the two PCs. There are two scopes and a third thing, in the rack, that also looks
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cheater cheater
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#184932
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Re: 5642 rectifier tubes in a Tek 535: Replace or swap for silicone?
Dom, Diodes are made from many materials, but silicone is not one of them. a note of correctness: Silicone is a polymer used to make things slippery, as in a lubricant. Some adhesives are also made of
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rick
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#184931
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Re: Tek Scopes found in old picture book
If you could check your book I would be interested to know if that picture is actually in it - the copy of it on archive.org does NOT have that picture in it! I suspect there were multiple printings
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Dave Brown
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#184930
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Re: 7000 test/cal module(s) and backplane breakout board.
I think you'll need at least two TS detectors (like maybe the first and last), so you can figure out the actual running frequency and interpolate the rest of the slots. In my readout exerciser, it is
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Ed Breya
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#184929
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Re: 7000 test/cal module(s) and backplane breakout board.
I'll try and get a schematic into the computer tonight and show you what I am thinking of. I wasn't talking about changing the edges of the TS pulses, just my circuit's response to those intentionally
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Andy Warner
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#184928
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Re: TM5xx extenders
My bad, I thought it was a new topic.
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Ke-Fong Lin
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#184927
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Re: 7000 test/cal module(s) and backplane breakout board.
Looking at the waveform picture, I see that you're looking at speeding up the response of the TS detector, which is OK. I think I misunderstood that you were considering speeding up the actual TS
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Ed Breya
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#184926
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Re: 7000 test/cal module(s) and backplane breakout board.
Current mirrors should work fine. I presume you meant to say four PNP transistors for the DAC and level shifting from ground referenced and +5V powered TTL/CMOS. I looked at all sorts of schemes back
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Ed Breya
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#184925
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Re: TM5xx extenders
The term "rolling" is mentioned several replies earlier (in a post by ditter2 on 11 March 2019) it says the following: Now that I've read it again it sounds like this might be able to be done by hand
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Jeff Dutky
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#184924
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Re: 5642 rectifier tubes in a Tek 535: Replace or swap for silicone?
Thank you, Ken. This mod kit replaces early-production 500-series selenium rectifiers in the LV supply with silicon. There¡¯s nothing for the HV supply; modded scopes continued to use 5642¡¯s. Sent:
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Dave Wise
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#184923
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Re: 7000 test/cal module(s) and backplane breakout board.
I used a caliper to measure several of my plug-ins, and went with my best estimates based on that, then tested with laser cut non-functional blanks for fit. I only just got the boards back from fab,
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Andy Warner
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#184922
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Re: Tek Scopes found in old picture book
The upside-down black and aluminum cylinders look like British 9-pin loctal tubes, or more correctly, valves. The shorter aluminum ones are likely the famous EF50
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John Atwood
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#184921
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Re: TM5xx extenders
What do you mean "rolling" on the fingers? Do you mean the notch between 6A/B and 7A/B?
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Ke-Fong Lin
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#184920
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Re: 7000 test/cal module(s) and backplane breakout board.
What's the height or rather width you used for your finger connector? I had a similar project for debugging purpose (https://github.com/anotherlin/tek_7k_ext). However, I didn't add "margin" on top
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Ke-Fong Lin
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#184919
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Re: 7000 test/cal module(s) and backplane breakout board.
My current prototype does this with 4 NPN transistors sourcing 8-4-2-1 weighted currents into a wilson current mirror, nothing harder to source than 2N3904, 2N3906 and some E96 resistors. Time will
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Andy Warner
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#184918
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Re: 7000 test/cal module(s) and backplane breakout board.
So far, I've been quite happy with all my orders with JLCPCB. The only problem I had were cosmetic, some scratches on PCB. You can have an idea of the board they produce:
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Ke-Fong Lin
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#184917
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