I have a problem with the right channel on my TFM-25.
For weeks it would spike the right power meter at startup, then play fine. But recently I powered it up and heard popping noises from the right channel and it shut down. Now the popping has stopped and it will play on both channels as long as the volume is set very low. When I push the volume above about 3 watts output the protect circuits trip and shut the amp down.
I have recapped a few amps but that's just removing and replacing parts. I have practically no electronics experience and I'm lost trying to troubleshoot this problem. I checked the idle voltages on both channels and found the left channel was OK at 1.0 mv and responds to the trim pot but the right channel is 2.8 mv and doesn't respond to the trim pot at all. Also, when discharging the big power supply caps (10,000 uf) using my 75 watt lamp, the left cap lights up my lamp brightly but the right cap doesn't light it up and tall (the amp had only been switched off about 1/2 hour earlier so both caps should have retained charge). I figure that big right channel cap is being pulled down by something shorted downstream somewhere but I have no idea how to find it.
I anyone can offer any advice, I'd be grateful