Bottlehead Kits > MonAmour
Oh NO! Left channel down! [resolved]
Ivan303:
OK, tubes light, swap with right channel tubes, still no sound from left channel (thankfully not one of the EML 2A3s which are REALLY expensive).
Where to start?
Near 400V B+ on the 300B.
2 LEDs light up on the B side but no LED lights on the A side of the regulator board.
About 100+ V on each of the heat sinks of the two MJE5731.
This after working perfectly for near to a year.
Sudden, not intermittent.
Maybe not something I did(for a change), as have not messed with these guys for nearly a year.
Guessing one of the solid state parts on the board?
Thoughts?
Thanks.
Paul Birkeland:
Can you post the voltages on all four pins of the 4 pin socket? (which hopefully has a 2A3 plugged in, not a 300B).
Also measure and post:
IA, OA, IB, OB, KregA, KregB on the driver board.
-PB
Ivan303:
Type-o
Tube is a 2A3EH GOLD!
61.9V
64.3V
382.0V
14.5 mV
Paul Birkeland:
OK, the 4 pin voltages are fine. How about the ones on the driver board?
Ivan303:
AND...
IA 409V
OA 111V
IB 111V
OB 111V
KReg A 2.71V
KReg B 109V
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