[FXpert]

I'm restoring a 42-350 I've recapped and all tubes test strong except the two 7v7's. All tube voltages seem to be within specs. My problem is low volume. After rechecking my recaped connections to make sure I didn't make any mistakes I discovered I have plenty of volume in push button mode. I've tried cleaning the band switch with contact cleaner and tried to scrape the brass where I could to make better connection. It doesn't look corroded.
Is there a way I can eliminate the band switch as my problem? What other problems can be causing this? I feel I have tunnel vision now as I feel the band switch has to be the problem. Can it be the weaK 7v7 tubes? I have another 42-350 with a bad transformer, but guess what? Every tube but the 7V7's.

Thanks in advance.