A used Music Reference RM9 - I think one of the best EL34 based amps ever made - but not "euphonic" - for that I would try an older Conrad Johnson like an MV50.
McGarick, I don't think QS is underrated by many who have owned them. You'll find many folks owning them for years and possibly "upgrading" to their newer or more powerful products. Glad you like it, they should last you a long time too.
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