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Thank you all that responded, I have now contacted VintageTek Museum to inquire. QService where not listing these particular parts

Thanks and kind regards,
Daniel

The Novasensor product line is still around. Jim Williams's AN61 () includes several application circuits that might help you think about what could be in the probe.

--
George

While looking for some manuals I found the bitsavers.computerhistory.org site.

It has some very high quality manuals including TEK ones.

Regards,
Brian

Thanks. The ebay listing is for the pressure transducer part of the probe set I have. Definitely labeled as Tektronix gear. The probe assembly has a Lemo power cable and a P6137 style BNC connector and body. Maybe it was a custom probe for internal use or a particular customer. Just trying to figure out if I can use the probe amplifier for anything interesting but I'd definitely need to find a schematic first.

Bill

Hi David, and thanks for the suggestion.

That could well be the case.

It seems that I need to figure out which part of the PSU board supplies the horizontal control circuit?

Whatever is causing this, is 100% located on that board, and nowhere else.

So far, on this original PSU board, I've changed two of the four Rifas, three resistors (which were all burned out), eight of the electrolytics, five LM358's (which had heated to the point of losing their graphics), three 1N4007 rectifiers, tested all the remaining caps for high ESR and probed across almost all of the remaining components looking for a short, but to no avail.

It's almost like the component only fails when a voltage is applied or it's put under load.

Unless someone has a better idea, I'm considering powering-up the two PSU boards side-by-side and taking readings at every point from the AC in, until the various DC outs, as surely that would reveal where the 'issue' lies?



Onwards and upwards.

James

Thank you, Jared, for the gesture. I really appreciate it. 73!

A glow off to the right might suggest that the left horizontal plate signal was disconnected ...

Further testing..

Swapping the known good PSU and top boards into the original 2430A reveals that the display problem is indeed created by the original PSU.

The original scope starts up and has a perfect display, as well as various diagnostic FAIL's, but we can take it that the HV board is functioning.


Now to figure out what is going wrong in the power supply..

James

Shall keep this short, however...

swapping the PSU from the 'original' (no display) scope into the working 2430A, brings back the 'BEEP' and the glow off of the right hand side of the CRT (no display).

It is surely fair to assume that the root of the problem lays on the PSU board?


James

Ok - thank you. I'll try it as soon as I got my 3034C

These schematics are for the TDS540, but the power pins will be the same:





Jared

Thanks for the reply...

After having spent some time going through the CPU/CTM schematics I am inclined to agree with you, it's more probably a mechanical connection problem somewhere. The un-read CH1 probe sense ring is easy to check.
The D0-D7 bus lines on the 6802 are MUXed to many places, not only reading the push buttons but also the ROMs running the firmware. Given that, I suspect an active component failure on a data bus line would kill the entire CTM firmware function including the scrolling "Control Button Error" message. Hopefully it's not some small timing problem in one of the multiplexers...

It won't be the first (or probably last) time I will have reseated connections in my older gear. It's the price we pay to keep legacy equipment operating.
I just need to be particularly careful with the CTM/DMM button extension and Time position knob removal (if necessary). Don't want to break any plastic parts...

See

It has an alternative part number

(Not my auction just a Google result)
Sent via mobile annoyance thingy, please pardon any typos.

On Sat, Mar 8, 2025, 9:09?PM ed breya via groups.io <eb=
[email protected]> wrote:

If your probes don't seem to be Tek or related to engine analyzers, then
also look at HP's foray into laser interferometer systems, which had some
transducers for barometric pressure, temperature, and other physical stuff,
to compensate for effects on the laser optics. HP also had some other
pressure transducer stuff related to HPLC and GC in their analytical
equipment lines, up to around 6,000 PSIG.

Ed

If your probes don't seem to be Tek or related to engine analyzers, then also look at HP's foray into laser interferometer systems, which had some transducers for barometric pressure, temperature, and other physical stuff, to compensate for effects on the laser optics. HP also had some other pressure transducer stuff related to HPLC and GC in their analytical equipment lines, up to around 6,000 PSIG.

Ed

Here's the rest.



Ed

I had to look. Here it is. Good luck.



Ed

Are these Tek products? If so, look at the engine analyzer line from way back. One of the Tek "Concept" book series addresses this so may have some pertnent info.

Ed

In my collection of probes, I have a P6610 physical measurement amplifier and three P6610 pressure transducers. I don't have any documentation and a search of the usual sources has come up empty. Wondering if anyone here knows anything about this probe or, better yet, has some documentation they would be willing to share.

Thanks - Bill

Do I see a 27xx spectrum analyzer? Expensive for parts but for dirt cheap project maybe.....
The rest is landfill.

I am here as well.

On Sat, Mar 8, 2025, 4:38 AM David C. Partridge via groups.io
<david.partridge@...> wrote:

AFAICT I am now the only active moderator. I think we need some more
moderators.



Cheers, David