I have a 1967 Rowe AMI MM-3 with one channel of audio missing. I do not have a service manual or schematics, nor do I really have all the equipment needed to troubleshoot properly (oscilloscope to see where the signal stops would be great to own but I do not have one).
What area is a common problem on the amp? I have verified the pre-amped input signal (via RCA connectors) from the tone arm is good on both channels, and I've verified both of my speakers are good. I have narrowed it down to somewhere in the amplifier case. The filter caps are all original so that may be something I should replace anyway.
Any help would be appreciated. Thanks.