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Need help identifying missing tubes for mystery amp

Guitar amps are a fairly alien land to me so its entirely possible they sound different in that spot. All I have is a datasheet and one amp that uses a decent bit of feedback to quash out any minor differences. Its kind of the endless "which tube sounds best" question. On paper they are all the same bu in practice thats not quite so.
 
FlaCharlie said:
New production 6EU7s are also available ("Tung-Sol") although I expect they are just re-pinned 12AX7s. Don't 6EU7s have spiral heaters or something?

Old production may have gone up in price but they aren't exactly hard to find. Lots of options.
Click to expand...

Many later 12AX7As had spiral heaters too, for reduced noise. Once the 7025 came out, most manufacturers just standardized on the spiral heaters for both it and the 12AX7A.

Regards,
Gordon.
 
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