LM3886 Power Transistor help needed

[jimmy74]

Ok tried without the current limiter and the main 40v rail gives me 37v so that's ok but where I was getting -13v before, now it's stil -2.3 (pin 8 on the amp chips).

[jimmy74]

I tracked back the negative voltage to R57 which on one end is connected directly to the LM337 -15v supply and infact reads -13.4vDC. On the other end which tracks to pins 8 on all amp chips an to the negative side of C54 reads -2.3vDC. R57 is 10k and after a few seconds of steadily rising readings it reaches 9.91k.

[Roly]

You seem stuck on the -2.3V on pin 8.  Looking at the datasheet this appears to be operating normally.  More to the point is what this voltage does after switch-on, which I would expect to shoot to +15v (Muted) then fall rapidly to some valve below ground (un-muted).

Do you have a problem?  Are the output amps Muted?  If not, no problem.

[J M Fahey]

I tracked back the negative voltage to R57 which on one end is connected directly to the LM337 -15v supply and infact reads -13.4vDC. On the other end which tracks to pins 8 on all amp chips an to the negative side of C54 reads -2.3vDC. R57 is 10k and after a few seconds of steadily rising readings it reaches 9.91k.

OK, so you have -13.4V on one end of a 10K resistor and -2.3V on the other.
What is this telling you?
(hint hint Ohm's Law  )