Sdcampbell, Thanks for the advice that's a good idea. This is going to make me sound like an idiot but I don't know how to change the tubes, it didn't come with a manual and I can't figure out how to remove the top cover. I ordered a manual from Axxis which should be here next week though and I'll try it then. Thanks.
Tube Question
I recently installed an Air Tight ATC-1 preamp into my system. I noticed that the left channel was considerably noisier than the right but not so noisy that I couldn't live with it. Very recently, however, there is a low level, high pitched squealing sound from that left channel. Is this due to a bad tube? The line stage uses one 12ax7 for each channel. Thanks in advance for your help.
Jon
Jon