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Re: Atma-Sphere M60mkII.3 with 6 ohm speaker??

While the power supply boost and teflon caps will certainly help, I agree that without the ZERO autoformers the performance might be marginal, but it's worth a try. If considering MA-1s I would recommend Mk II.2 or later if possible; Mk II.3s built this year are easier on the output tubes and have some other advantages. Perhaps Ralph Karsten or Bill Layer will chime in here to comment on how they might match up with your speakers as compared with current M-60s.

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