change pairs with a known good pair from the right channel and see if the LED re-lights on the left side and goes off on the right channel.
Question about Cary V12 amplifiers
I purchased a pre-owned Cary V12R stereo amplifier (recently re-tubed). It sounds and looks great. One of the 'good health' LEDs for a pair of output tubes on the left channel, however, is no longer lit. The tubes appear fine, and I don't notice any sound degradation. Before I adjust bias or purchase tubes, does anyone have any comments or suggestions?