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Hi People, my first post,thanks, I am intersted in a pseudo clone of the ST-35 Dyna, I found this circuit 12AX7, instead of 12DW7, that you think, welcome your comments and suggestions, sorry for my bad english,is not my mother language,thanks,
Martin

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This is basically a simplified version of the ST-35, without the two extra feedback paths that the original design had.

The 12AX7 should perform well in this circuit, and it is more easily obtained than 12DW7 or 7247. Though I am not sure, without running a simulation, what the phase splitter plate / cathode current might be, and if it would exceed the maximum 12AX7 ratings.

J/J does have a 12DW7 equivalent, the ECC832, so there is a less expensive alternative to the vintage tubes.

/ed B in NH