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12AX7 are not "drop-in" substitutes for the 12AT7 - they have different gains and other tube characteristics. Similar tubes to the 12AT7 are the 6201, ECC81. and 6679. Not any experience here but I believe they are very similar with just different nomenclature. BTW that is in the manual.
I married the perfect woman. The downside is everything that goes wrong is my fault.
Edits: 02/16/17Follow Ups:
The switch to 12ax7 is for the switch to 6CA7 as per Manley.. They run 12at7 with EL34's. Im sorry I don't know why technically why their circuit asks for that switch. As mentioned I'll check the 2 output tubes with some old ones I know work to see if its them.
Think you mean 300mv not 300ma. 300ma would burn up the tube pretty quickly.
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