03-09-2010, 05:00 PM
I'm in the process of restoring this great console. It's working but, after its on for 5 minutes or longer the sound becomes a bit distorted and the phono part loses most of its rich volume. I have the schmatic but do not have a tube tester. The only tube that is not orignial is the rectifier (5Y3GT). I was thinking it could be the DET-AVC 1st Audio (7C6) breaking down. Any suggestions?