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Does anyone know the tube compliment for the original MA-1 (12 6AS7s) with the fourth 9 pin tube (CCS) added. I know the driver tube didn't change it's still a 6CG7/6FQ7. The problem I'm having with these amp is that they came in with Chinese tubes but with no markings. I don't know if they are testing as worn out 12AT7s or just OK 12AU7s.
Craig
Follow Ups:
Usually on the old Mk 1s, if a CCS tube was added it was a 12AT7. The usual tube complement was thus three 12AT7s and one 6CG7.
Thanks again Ralph!
Craig
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