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RE: 6SL7 C4S driver ...

The 6SN7 was too lazy, not enough gain or jump factor in my multi-amp set up for good level matching.

I set up 6SL7 C4S but got horrid distortion until I realized that I needed at least 2mA bias current for the extended C4S to work properly.

THD = 1.24% at 1W with 1KHz sine input.

Overall gain = 2.5

I realized an improvement of about 1% THD vs. 6SN7/triode 6V6 active parafeed circuit at the same 1W power output.

Not sure that JM or DF will approve of your pentode driver for 2A3.


DT667



Edits: 05/11/15
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