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In Reply to: RE: Another excellent troubleshooting video and theory behind it posted by maxhifi on April 22, 2016 at 22:48:03
The take away from this video, is that your filter caps may need a way higher voltage rating than you think.
Indeed and like Paul mentioned in the video,the older cans could handle over voltage much better than the small,single value new caps.. The new twist-loc cans tho from Authenticap and CE are very good actually and the AC can handle up to 600vdc at turn-on and 550vdc on the CE.
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I am fixing up an old 1935 era GE radio, and despite the 350V B+ it needs 500V capacitors... I calculated the surge voltage to be 505V, and that assumes 115V AC line. I will probably use 2 350V units in series for some extra margin. Those of us more familiar with solid state bridges and lower impedance trabsformers would probably assume a 400V capacitor would suffice for a 350V B+ line. I like how in the above video the presenter goes to the trouble of explaining the ins and outs of such an archaic design, it was useful info.
Esp from the 1930s. Only seen Rickenbacker amps of that era and they were very rudimentary. No interstage trannies.
Only seen Thordason transformers.
Thanks, for link.
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