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RE: Rebuild of MC30s

While the 12AU7 gets little respect these days, as TK points out, it might be slightly less a "Mac" without it. Obviously, Mac managed to get around the AU7's shortcomings and used it in most of their amp designs thru the 50s & 60s.

If the 12AU7's reputation bothers you, a plug-n-play alternative is the 12BH7...no socket rewiring nec. Not quite as linear as a 6FQ7 however.

Another possibility would be to replace the PI (12AU7) tail resistor with a CCS and make the load resistors equal.

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