it happens on certain records that may rumble.
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Thanks again, Atmasphere. Planning to swap pre-amp interconnects and also (but separately) amp/speaker pairings. Pre is tubed...2 6H30s and 1 EZ80.
BTW - changed out ALL the left amp tubes. Still got that movement after listening to a few tracks and once signal stopped. Apart from the fact this is unusual behavior, I'm concerned about the possibility of "an uncontrolled excursion" resulting in damage to the speaker.
FWIW - reversed the ICs between pre-amp and amps. The noise and driver movement shifted from the left to the right speaker. Reversed the two 6H30s in the pre to see if maybe one of them was going bad. After pulling and re-installing them, no more noise or unusual driver movement...not on start up nor on shut down. Will check again today to see if things remain OK.
Ha! Called it.
Its not likely that its a bad connection on the tube socket- that would sound different. Your handling of the preamp tubes has likely stopped the errant tube for a while, but my forecast is that it will be back eventually.
You swapped the preamp tubes left for right so now the problem will be back in the left channel if it is a tube.