On Sat, 3 Jun 2017 20:32:57 +0200, "megamusic" wrote:


That's the channel that appears to be working OK. There's almost no signal
at all on the anode connections of the other channel, for any position of
VR27A/B, and the channel goes quiet as the pot is rotated clockwise.

There's normal-looking signal at pin 8 of both IC1C and IC2C for each
channel, the op-amp phase inverter, though.

Check X10-X18 cathode ground wire, especially if it is flat IDC cable
(common problem in behringers)


Just curious. What is that thing. I looked at the photo but could not
read the details on it. Is it a preamp or what?
Having both ICs and Tubes is kind of unusual too.
Looks kinda cool, whatever it is.....