Any experience with old Ei preamp tubes in Mark amps?

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MK IIB

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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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