TU-8200R right channel fails if left on

Hi,
I built an 8200R and fitted it with 2x Golden lion KT88s. If left powered on with no signal input for some time it fails to produce sound on the right channel. If you switch the amp off and on again the channel comes back on.

This is only an annoyance, but I would like to fix it. Anyone got an idea that might help track this down?

Gus
 
Victor is the North American distributor for your kit and he is trying to help you out. It is easier and more effective to call you on your phone and ask a few questions rather than messages flying back and forth on the forum. You don't need to post your phone here either for your privacy. You can send it via PM or email.