The issue I am having is when I power on sometimes I get a quick glow from the left and center driver tube. It is exactly what happens when I use a dim bulb on a amp I'm testing that is working normally. The light glows bright and quickly dims down.
I'm sure this is not normal since the right driver tube does not do this and I didn't have this issue before. I checked all voltages and they are within spec and like I said I biased the power tubes easily and they stay accurate.
I listened to the unit for several hours today and it sounded fine to me.
Would appreciate any insight into how I can solve this matter. Thanks.