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Wildly fluttering woofer

Without any kind of warning the left woofer of my Thiel 7.2 speaker started fluttering-the excursion was at least two inches. Won't happen with a CD. Tried another record and the same thing happened again. I have not switched speaker cables.
System: VPI Mark IV turntable with Graham Phantom arm and Dynavector XX2 cartridge, McCormack DNA 500 amp, Audible Illusions Modulus 3B pre-amp, Thiel 7.2 speakers, all wires are Audience. HELP!
katz1

Showing 3 responses by atmasphere

atmasphere's avatar
atmasphere
12,138 posts
 
Its not a speaker cable :)

Its in either the phono section or the setup of the cartridge itself. Since its only in one channel I suspect the phono section, which may have a noisy tube.
atmasphere's avatar
atmasphere
12,138 posts
 
So the problem was not feedback.

A noisy tube in the phono section is still at the top of the list.
atmasphere's avatar
atmasphere
12,138 posts
 
Heyraz, the argument against feedback is that when it was happening, it was only in one channel. If it was mechanical feedback it would have been in both channels. The two phono channels of the preamp are right next to each other.
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