So I've cleaned this guy and replaced all the capacitors in the power supply section. I thought I finally had it working and it sounded great on headphones. I hooked up some speakers and it initially sounded good, but I've started to get an intermittent distortion only in the left channel. It's primarily in the bass and effects both A and B speakers. If I have either (or both) sets on I can hear it on the headphones. Turning off the speakers cleans up the headphones. At first, cycling the power or changing the source would clear the problem for a while, but that seems to be getting less effective. I thought maybe it's a bad solder joint, so I reflowed the TR421-424 joints, but that didn't help. mbz posted some transistor voltages in this post: http://audiokarma.org/forums/index....quested-with-next-steps.765622/#post-10465361 I'm going to check those next time I get a chance, but the pdf service manual I have doesn't list those? Anybody have suggestions for me? Thanks!