My experience echoes Mulveling's
Never had a power tube be microphonic in the slightest.
Tube microphonics
Hello. I am using Audio Research Ref 750 mono blocks and they in front of my speakers but off to the sides. Someone told me on another site that if I move the amps beside the speakers and not in front of them , my system will improve immensely. It will reduce tube microphonics. What are your opinions of this and I just want to say that I’m very new to tube amps so this is something I never heard of before. Thank you all.
Showing 3 responses by jetter
I know this is kind of backwoods, but then again I live in Vermont. If I had your beautiful setup, here is what I would do before moving your heavy amps around. @jjss49 if you think this is a bad idea please chime in. With your preamp, amp and CD player on, I would set the preamp to CD mode. I would turn my preamp up to about 1/10th volume (any VERY low setting). I would GENTLY tap on the top of the preamp cover, then CD player cover, and then sides of the amps. If I did not hear the dreaded (thump) or a tube rush sound I would repeat this, increasing the preamp volume, in small increments until I was at about one half volume. This should take in total about 25 seconds. If you do not hear a "thump" through your speakers when taping on your units I would say you have nothing to worry about regarding microphonics. In my layman's way of explaining it, microphonics are the result of anything vibrating a tube sensitive to microphonics, whether by picking up speaker vibrations, taping the top of the unit having the microphonic tube or any other movement.
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