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Single Ended Triodes (SETs), the ultimate tube lovers dream.

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Original Message

2 stage SE

Posted by andy evans on June 11, 2022 at 16:21:00:
"For single ended, my personal dogma demands a two stage amplifier (no preamp!) with directly heated pentode or triode output tube; low impedance power supply, direct coupling and a high transconductance driver tube capable of driving the output tube to clipping with an input sensitivity of 1Vrms."

I agree totally on a 2 stage amp with no preamp. I'm getting away with 6SN7 into 2a3 because I have a smaller room and don't listen loud. The HY69 and 5516 are unobtanium in the UK. I used EL38 for a while but I don't need to since I can use a 2a3, which I prefer to 300b. As driver I've had quite good results with the E180CC. Haven't tried the EC86 yet but I have some. Not direct coupled, but teflon coupling caps which are as transparent as I can find.

For rectification I preferred a 5U4 overall, but I do actually use SIC diodes in the power supply for the driver stage when I put that in a separate chassis. Essentially it's a 6SN7 line stage and the SIC diodes 1200v sound very nice. DC Link caps as last cap in the PSU and for the driver stage.