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RE: The MP-1 and MP-3 servo system

I think I did the tube regulator to solid state regulator cum CCS, very soon after I purchased my MP1. I have also removed the 12AU7 socket and replaced it with an octal, so I have been using 6SN7s for probably 20 years. Even though the two tube types look very similar on paper (mu, plate resistance, transconductance, etc, are near identical if not completely identical), the 6SN7 sounds far better. Highly recommended.

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