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RE: Fisher MPX-65 Tubes?







Thanks for the reply.

My service manual shows those tube marked as v100, v101, and v102. V102 is the tube adjacent to the balance control; Which one is the other tube I can swap out with a 12AT7?

I read somewhere that early Fisher 400's had two 12AT7 tubes rather than three 12AX7's.

If I understand your reply; Your saying that the 12AT7'S are a upgrade over the 12AX7?

I just changed out the 330k grid resistors with 200k, as well the .047uf coupling caps with Russian K40 .1uf PIO caps.






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  • RE: Fisher MPX-65 Tubes? - geezerrocket 20:32:03 10/31/14 (0)

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