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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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