Marantz 2270 Phono Preamp
Hello all. New to the site. Wonderful uploads of information on here. I recently had someone local repair my 2270. I bought it used at a steal for 50 bucks. Sounded amazing. After about 45 minutes the left channel would just begin to fade out. Then it would pretty much stay out. Had a local guy in atlanta do a good job on it. Got it back and it sounded wonderful. I have had a 4240 for years and this one just blew it away. Well then low and behold the phono amp board starts to give problems. It was only on the phono circuit. I swapped the two inputs around. Same thing. Left channel just goes out after getting hot. Called the guy back he says well i didn't repair the phono board.... Great. So i pulled up the schematic removed the 6 wires and 4 screws. I have it out. I am an automotive tech so i am pretty good with soldering. Problem is i have no idea where to start. There are a few diodes and alot of capacitors on there. And from my understanding the capacitors have to be removed from the circuit to test them. Well if i am to go through all that hassle of undoing them all and any one of them could be bad after heating up i might as well just replace them all.
Thats where i need help! Radio shack is a joke. I went to mouser and that gets really confusing. I have pics as well.