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In Reply to: RE: Troubleshooting a JE Labs 300b amp posted by ddelaney on July 10, 2017 at 08:49:55
Does it use 'boutique' PIO coupling caps ? Some of these 'boutique' types sound great at first but have short lifespans and go out of spec within a few years
The coupling cap is an Angela Instruments/Jensen copper in oil.
Given the responses I've seen, I think it is prudent to replace the coupling and bypass caps in both amps.
After reading through a lot of posts last night, electrolytic bypass caps look to have fallen out of favor. Are there caps out there that are well regarded for the bypass position, and hopefully not as physically large as the P/S caps? Current bypass caps are a 47uf/160V and a 100uf/100V, Black Gates.
Replace the couplers first . If possible measure the value of the caps .
There a few film bypass caps to try . The smallest are polyesters and these are also available in lower voltage ratings which helps keep the size down . Kemet R60 series are pretty decent and fairly small
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