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 Replacement part query

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Join date : 2011-12-28

PostSubject: Replacement part query   2013-12-07, 2:30 pm

Will someone please look at the schematic diagram for RCA model 97K (Rider 10-91) and tell me the purpose of electrolytic capacitor C.41 and if replacing what the working voltage should be (no indication on the original part nor stated in the RCA service data). Thanks. By the way, this is not a 'quiz' or a trick question.
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Steve Johnson

Join date : 2013-10-26

PostSubject: Re: Replacement part query   2013-12-11, 6:15 pm

I checked the original RCA factory service manual and the voltages aren't listed there either.
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Join date : 2011-12-28

PostSubject: Re: Replacement part query   2013-12-12, 2:18 pm

Like I said, ". . .no indication. . .in the RCA service data." Also, so far no one has answered the other part of my post, what is the purpose of C.41?
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Cliff Jones
Site Administrator
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Join date : 2010-11-22

PostSubject: Re: Replacement part query   2013-12-17, 9:31 pm

I am guessing onlyRolling Eyes 

It looks like additional filtering (by-pass) to supply by voltage divider( R17-R14) to tubes 6k7-6k8 AVC? That voltage could range from 78v to 180vdc.
After reviewing several like RCA Schematics.
However I don't claim to know.
A clearer Schematic is in Bietmans Vol. # 1 (1926-1938 page 178). But all voltages are also missing.
Look up the nominal operating voltages in a tube manual for 6k7 and 6k8, that should get you in the ball park.

I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!
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