Thanks. I didn't have >63V in 4.7 and 10uF, so I measured (VDC) over each cap. I'm not completely sure why my readings showed such low values? Since the caps are rated 63V, I would expect something like 30-40V. But for short test, I stuck in 50V.
I replaced these:
C29/C30(blue): 47uF/25V - was completely blown. Replaced with 47uF/63V.
C27 (purple): 6.8uF/63V - was 38nF. Measured 2.7V over it. Replaced with 10uF/50V.
C23 (green): 4.7uF/63V - was 155nF. Measured 1.9mV over it. Replaced with 4.7uF/50V.
C12 (purple): 6.8uF/63V - was 1.2uF. Measured 72mV over it. Replaced with 10uF/50V.
C1 (green): 6.8uF/63V - was 4.9uF. Didn't replace.
Now channel 2 also works (previously only ch 1 worked). I guess C12 messed up the volume pot of channel 2.
But they short story is, R46 and R47 becomes really really hot (110'C after 1-2 mins).
I was supposed to open a new thread and wrote along text, but if anyone here have some insight, I'll paste it in here first:
I found a great defective 2ch stereo rack amplifier the other day, H.H. Electronic VX-150 MOS-FET. Not sure how good it is from an audio perspective, but it was used by one of the largest TV broadcasters here in Norway. I popped the lid and found two blown capacitors (C29/C30). Replaced them and had my thermal camera ready, then powered it up with a 4 ohms 200W dummy load and 500mVpp sine connected. The two switches on the rear is set to UNBAL (not TX BAL or BAL) and STEREO (not BRIDGED). There are also two sockets (without anything connected), TXB1 / TXB2, which I haven't seen before. Not tubes I assume?
Anyway, it outputs a rather dirty sine, and R46 and/or R47 (620R 3W) rises to 110'C after only 1-2 minutes. So I turned it off in case something more would blow. Is this normal, or what could this indicate? The R46/47 are located right next to the previously blown C29/C30. They are circled in royal blue.