Fisher MPX-65 Tubes?

Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

I have a MPX-65 in my Fisher 500c. I believe Fisher used that same multiplexer for the 400, 500b, 800b & c.

I have heard that some of the 400s used 12AT7 in two posistions on the multiplexer.
Does anyone know if this is true, and which 2 of the 3 positions could I substitute a 12AT7 for a 12AX7?

I ask because I have a lot of Amprex 12AT7 Tubes - not many Telefunken 12AX7 smooth plates.

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Topic - Fisher MPX-65 Tubes? - geezerrocket 09:20:57 10/31/14 (3)

RE: Fisher MPX-65 Tubes? - sony6060 13:54:21 10/31/14 (1)

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

RE: Fisher MPX-65 Tubes? - Eli Duttman 10:44:08 10/31/14 (0)

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