In Reply to: Can you spot the problem? posted by hifipaul on March 28, 2015 at 20:14:22:
Thanks ALL for your comments;
The first BF Cap after the rectifiers was 650uf, 6x the max ratings. Diodes worked well but had ~ 8 amp turn-on surge (tuff on fuses). The 2x 100mf cap (500v) took care of PS issues well enough that JJ 5ar4s work OK.
The owner wanted the amp as original (as close as reasonable). I converted it back to 8417 with changes to the bias arrangement + it now has dual bias pots and simple meter test points.
Listening: Interesting sound, I am normally not too thrilled with UL type sound. These are better than any I've heard. They have a clean and punchy sound.
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Follow Ups
- RE: Can you spot the problem? - hifipaul 17:57:40 03/29/15 (2)
- RE: Can you spot the problem? - unclestu 18:41:49 03/29/15 (1)
- RE: Can you spot the problem? - hifipaul 15:39:59 04/02/15 (0)