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RE: Too low plate R value for a triode ? and CCS substitution?

If you want to try a CCS plate load a cascode MOSFET would be a good choice (K&K Audio sells a convenient kit). This CCS works best with about 30V across it. That would leave 28V for signal swing. A CCS load should result in lower distortion. My only caveat here is that my experience with 6N30s is they like more voltage on the plate; 80V seems kind of low. In my preamp (differential with CCS "tail") the OP is 150V@25mA.

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