unidentifiable part

DickCappels

Joined Aug 21, 2008
10,661
What sort of function do you think it has/had?

What did it come from. The more information you supply, the more likely somebody will recognize it.
 

MisterBill2

Joined Jan 23, 2018
27,227
OK, if you need to order another one then you must also know what it is a part of. If you are willing to share that information then we can probably offer some useful assistance. Without that information and probably some descriptions of what it was part of, I will not even provide a guess.
Really! Folks ask questions without providing the slightest context, and unless I have recent experience with an identical issue it is unlikely that other than random guesses happen. Or folks show only a small portion of a circuit and seek a system analysis.
I need the context.
The device in the picture has an octal plug, and four adjustments.
 

MisterBill2

Joined Jan 23, 2018
27,227
I am going to say that is a 60Hz Twin T Filter unit from an HP 425A DC Microvolt-Ammeter, missing it’s cover.
That answer can only come from a familiarity with a rather uncommon piece of equipment, or an excellent imagination. Quite probably "Y" owns such a device, or has used one quite a bit. I am not at all familiar with it at all.
 

Ya’akov

Joined Jan 27, 2019
10,226
That answer can only come from a familiarity with a rather uncommon piece of equipment, or an excellent imagination. Quite probably "Y" owns such a device, or has used one quite a bit. I am not at all familiar with it at all.
I don’t, and have seen one in a lab only once that I recall—but the process went something like: that looks like a banana jack adapter for some old test gear (octal plug was a clue), but it was a bad guess because looking more closely I found what I took for banana jack binding posts were, in fact, pots.

But, it looked old test gear still—and not Genrad, so… HP? 9110-0038 turns out to be an HP part number after all, and there is a singular copy of the service manual for the 425A online. The part is listed there, along with the alignment procedure for it, but there is no recognizable photo because it is only shown with cover on and in place on the chassis.

None the less, I am 98% certain that’s the correct solution.
 

MisterBill2

Joined Jan 23, 2018
27,227
Quite interesting, and from the circuit schematic in the manual it is obvious that without that assembly the meter is unusable. But, given the information shown the assembly could be repaired or even replaced. So why would there be a need for one if the TS does not have that meter?? I don't see much other application for that assembly other than in that specific product.
 
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