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What OP tubes for DIY 6L6-type amplifier? pics

Posted by PeterI (A) on January 21, 2016 at 12:15:07

I built this amplifier w/ circuit based loosely on the classic Harman Kardon Citation V amplifier. It is performing and sounding great. Currently I am using 6P3S-E tubes. They vary a bit when I set bias. B+ voltages are lower than anticipated - I have 375VDC on the plates, not the 410-415V I hoped for; but not really worrying about it. I suppose I am getting lower power because of the lower voltages? Probably fine since I don't want to strain the OP transformers - 6Kohm, rated at 35W from older Sherwood S8000 rcvr. (VERY good OPTs, judging by what I'm hearing.)

Anyway, getting to the point, what other new tubes would work well in this? New russian 7581s? TAD 6L6WGC? GL KT66s probably wouldn't perform at their best because of the lower voltages, I was thinking. Bias is around -33V. I can set each of the 4 OP tubes separately and run them at 46mA now. Maybe a bit too high?

(I dismantle old electronics equipment for parts and that's where the chassis came from, so I made it look sorta like a lab instrument).

Thanks for tube suggestions.
-Pete

Edits: 01/21/16

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