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Re: 12sx7's in the new MA1 Silver Edition

The questions to ask, and which I cannot answer, are as follows: (1) Does the Silver edition have a DC filament supply? If so, it is certainly regulated at 6.3V, so you would have to find a way of deriving a separate 12.6V filament supply in order to use 12SX7s. (2) If the Silver edition has an AC filament supply, is 12VAC available by tapping the proper transformer leads (as it IS available in your M60 and my MA240s, for example). As for the autobias circuit in the Silver edition, I don't know much about it, but it no doubt regulates bias and/or plate voltage, which have nothing to do with filament voltages, so I am fairly certain there will be no problemo with 12SX7s on that score.

But if you have Coincident Total Victorys and if you love your M60s with 12SX7s, why make a change at all? Indeed, the M60s ought to be ALL the power you need, not just "almost" all.


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