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Another excellent troubleshooting video and theory behind it

107.213.0.168
Posted on April 22, 2016 at 20:23:15
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 Steve,you have probably seen many of these guitar amps but this one is really bazaar.Nice amp tho.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

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RE: Another excellent troubleshooting video and theory behind it, posted on April 22, 2016 at 22:48:03
maxhifi
Audiophile

Posts: 584
Location: Alberta, Canada
Joined: August 4, 2004
 The take away from this video, is that your filter caps may need a way higher voltage rating than you think.

 

RE: Another excellent troubleshooting video and theory behind it, posted on April 23, 2016 at 00:53:21
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 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.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

Never seen an amp of this type, posted on April 23, 2016 at 07:35:57
FenderLover
 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.

 

RE: Another excellent troubleshooting video and theory behind it, posted on April 23, 2016 at 10:24:46
maxhifi
Audiophile

Posts: 584
Location: Alberta, Canada
Joined: August 4, 2004
 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.

 

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