I would suggest tube dampeners. Eliminated microphonics in my amp.
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Yes they are microphonic. After talking with my dad (an experienced tube electronic tech), he thinks its because the speakers are to close. He didnt feel plate or filament voltage would cause this. Its always the tube closest to the speaker. I did some research and it seems the long plate Mullards go microphonic in guitar amps real quick, especially the square getters.
I may try some tube dampeners. I agree with Reb1208s statement on the Cary CD player. Im going to line it with dyna-mat.
Right now I have some Amperex 7316s in there. I must admit the midrange is unbelievable from them. I was surprised when I swapped in some mid 80s CV4003 Mullards. The bass was awesome The midrange sounds very nice too I was impressed for a tube made in 1985.