Speedball OA voltages low on SB and high on LB [resolved]

[Beranga]

They don't touch, resistance is out of range between center leg of transistors to solder points of heatsinks..

 

[Beranga]

Don't know if it would help, but when the big board was installed, one of the LED shined overly bright. Pic. attached.

 

[Paul Birkeland]

I think your best bet would be to contact replacementparts(at)bottlehead(dot)com to see about obtaining a replacement large Speedball board and parts.

 

[Beranga]

Can I listen to the Crack with only the small board installed while the new board arrives?

 

[Paul Birkeland]

Sure, you can use the amp with the small board and the 3K resistors.

 

[Beranga]

Before ordering a new large board, I measured everything and found the short!!! I was a faulty 2N2222A, once replaced all voltages measurements seem fine:

Small board
OA 70
IA 191
B-A 0
IB 191
OB 70

Large Board
OA 108
OB 108
G 0
B+ 190

Paul, thanks for you patience and all the help!!!