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Questions about tubes and gear that glows. FAQ

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RE: Read what?

Posted by Naz on March 21, 2017 at 04:56:54:
Gain of a 6SN7 using a CCS is pretty much the mu of the tube (assuming it's not driving much load of course).

OTOH Gain of 6Sn7 with unbypassed cathode R of 1K and a low 11K plate resistor is only around 13db according to Spice compared to approx 20db bypassed. And, distortion is approx 10db less than using a 22K despite the lower plate R.

I'm not saying this is the way to go but pointing out that gain can be significantly reduced using tried and tested methods.

Personally I don't like using Rs or Cs in the cathode and prefer to lightly load the plate but many report they love the sound of an unbypassed cathode R. It is a valid (possible) option that just might meet the poster's needs and therefore worthy of putting forward.

From a technical standpoint the combination of a lower plate R, and unbypassed cathode R can significantly reduce gain without increasing distortion. Whether one likes the sound is another thing.

Naz