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My unwelcome advise (?)

Posted by Feanor on May 3, 2022 at 11:06:48:
Add all your 2nd order distortion, (what's SETs are famous for), at the preamp stage. (It ought to be needless to say you weren't getting that from your Halco preamp.) Conrad Johnson preamps, (for example), are well-known for producing lots of pleasant 2nd order distortion.

Downstream stick to ultra low distortion power amp such as the Benchmark or Purifi-based amp -- potentially you'll save a crapload of money while having enough power to drive anything.