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  1. gvocale

    Dynaco ST-70 / Mark III / Mark IV - Which board to accept 12ax7?

    I came in possession of a Dynaco ST-70, a Mark IV and two Mark III. I am considering modding these amps, currently using their stock boards, with input boards which would allow me to use 12ax7 and 12au7. I have in fact a good collection of old ones of those and I would like to use them. I...
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