I have been experimenting with some SET Audio Amps and a couple of guitar amps that use EF86s and noticed that these tubes all seem to be inherently microphonic.
I have rolled NOS Phillips, Telefunken, Mullard EF86/6267 as well as new issue JJs, Mesa, Sovtek and others and they all seem to be microphonic to some degree...a problem that doesn't seem too acute using my little audio SET Amps but a real pain in the #** in applications like guitar amps that rely on the EF86 like the Doctor Z... tube dampers help somewhat, but I'm interested to know if there is something about the actual physical construction of this tube that makes this tube more susceptible to microphony?
Thks Leo
I have rolled NOS Phillips, Telefunken, Mullard EF86/6267 as well as new issue JJs, Mesa, Sovtek and others and they all seem to be microphonic to some degree...a problem that doesn't seem too acute using my little audio SET Amps but a real pain in the #** in applications like guitar amps that rely on the EF86 like the Doctor Z... tube dampers help somewhat, but I'm interested to know if there is something about the actual physical construction of this tube that makes this tube more susceptible to microphony?
Thks Leo