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Original Message
RE: Octals-med mu, low plate R
Posted by Eli Duttman on January 3, 2017 at 10:21:36:
Octal only is tough. Would that there was a 6SM7, whose characteristics were like either the 12AY7 or the 12AV7.
Perhaps some "trickery" will help. With its mu of 70, the 6SL7 has too much gain and it's a wimp. Buffering the plate with a DC coupled ZVN0545A MOSFET disposes of the wimp issue. You could set up 6SL7 LTPs to reduce the effective mu to 35. A possible plus to the LTP is the ability to select absolute polarity.