Tubes Asylum: RE: What value grid stopper resistor for 7a4? by DAK Questions about tubes and gear that glows. FAQ

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Posted by DAK (A ) on February 18, 2018 at 13:53:52

In Reply to: RE: What value grid stopper resistor for 7a4? posted by Eli Duttman on February 18, 2018 at 11:10:21:

Well, i have this annoying buzz similar to a cricket like buzz. I have the input rca jack directly linked to the input grid without a grid stopper. In previous SE builds with 6sn and sl7 i have not had this issue and that is at least 4 amps. Also other SE amps with 12at7 input tube also sans grid stop resistor, no issues. So, i suspect the 7a4 since it is capable of amplifying at much higher frequencies than the 6sn7. Plate voltage and cathode current are within design parameters.

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