Any experience with old Ei preamp tubes in Mark amps?

Mark I's, II's, III's and the almight IV

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MK IIB
Mark III
Posts: 191
Joined: Tue Sep 20, 2011 11:15 am

Any experience with old Ei preamp tubes in Mark amps?

Post by MK IIB » Sun Aug 27, 2017 3:14 pm

Have any of you tried the older EI 12ax7/7025 tube in any mark amp?
I got a NOS(what I think is a) Groove Tubes EI 7025.Long smooth plates.I've read they sound great but can be prone to microphonics.Is this the case with the older ones too?
I'd be interested to hear other folks opinions/experience with them?
Thanks.

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