Bottlehead Kits > MonAmour

Oh NO! Left channel down! [resolved]

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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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