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couple of things...

(1) As far as I know, you are correct, there is no difference between a "VT231" and an early type "6SN7GT". VT231 is merely the US military name for the latter tube. There are later versions of the 6SN7, called GTA and GTB that differ from GT types in their electrical maximum ratings, i.e., the latter two types can tolerate more plate voltage and a higher plate dissipation (Watts). This is not at all an issue in the MP3 or in the M60, except where you might want to use GTA or GTB types in the driver stage of the M60. (V1 is NOT the driver stage. V1 is an excellent place to try the Raytheons where they will make the most difference in sonics.)

(2) When you move the Raytheon(s) from the circlotron circuit of your MP3 to the input stage of the M60, the bias-ing of the M60 has nothing to do with that tube any longer. The bias adjustment is merely for the output stage in both the preamp and the amplifier. Your m60 uses 6AS7s in its output stage.


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  • couple of things... - Lew 14:30:52 05/24/05 (0)


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