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HP 400D Tantalum Capacitors?

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KK7DTE:
I'm not finding tantalum capacitors listed in the HP 400D VTVM service manual, but I have two in mine and I have seen two others online with the same capacitors. How do I find their values? They are heavily corroded. Maybe there are other schematics or parts lists I'm not seeing? This unit's serial number is 28830. Picture below:

factory:
And what is it connected too? I can't tell from the picture.

David

HalFoster:
Looks more like a diode to me...

factory:
Guessing it's these unlabelled parts on the layout drawing?

They seem to be C20 & C31 in the earlier book here; https://www.kennethkuhn.com/hpmuseum/scans/hp400d_h.pdf

C20 is 8uF 30V part #18-17 (aka 0180-0010 tantalum)
https://www.parttarget.com/5910-00-644-3743_5910006443743_PP8B30A1.html

C31 is 4uF 60V part #18-15 (aka 0180-0008)
https://www.parttarget.com/5910-00-643-6892_5910006436892_PP4B60A1.html/

David

factory:

--- Quote from: HalFoster on October 22, 2024, 05:59:54 pm ---Looks more like a diode to me...

--- End quote ---

Apparently they are an early form of tantalum capacitor made by Fansteel, attached is an advert from 1956.



David

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