My tuner was on. My preamp (anthem AVM-30) was on and set to a selection which has nothing attached to its in or out terminals. My amp (Cary/AES 2A3 SE-1) was on. I replaced the 6SN7 tubes last evening in the amp. Everything played beautifully last night.
The system was left in this "on but no load" mode as I do sometimes when I leave the room for a few minutes.
I returned to a deafening hum coming from the speakers and smoke coming from the preamp/processor. Turned everything off and let it all cool down.
It is playing now without problems except that the music is lifeless.
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