johnwmclean
Aka: capone, bignurse.
- Joined
- Apr 28, 2008
- Posts
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- 52
Is R21 completely counterclockwise? IC1 and IC2 are definitely not mixed up? All other initial checks are correct before you get to the output quiescent current?
I would say go with te DC filament supply. Its worth it for this amp.
I had slight hum with my EHHA, so I made a simple LM317 based DC supply(similar to one in EHHA rev. A ) & the hum is completely gone.
@Sachi :No clue. The mosfets were socketed earlier & I have my suspicion on a faulty socket but I am not sure how that would lead to Q7 getting damaged.
Today has been a good day. The EHHA 1 is back online & I also was able to finally finish my rev. A build. The first impressions are really positive.