But now there can be no voltage rise at the cathode when current increases. Your amp will be just like it is now at idle. Get a pair of 5 watt 6 volt zener diodes and solder them in series across the cathode resistor with the cathodes toward the voltage (instead of ground that is). You can just measure the voltage on the top of the cathode R. "you can still have fixed bias without placing the el84 cathodes at 0 volts. Intrigued and reading more I found Chuck posted this on a different thread a year later. With 9.5 volts on top of Rk at idle and 18 volts at full output, I find a 13 volt zener gives good clean compression attack but snugs up nice and tight when cranked and helps a bit with crossover distortion." "Zener on Rk to "fix" bias - I want to try using a zener across Rk on my cathode biased amp to help tame the crossover fizz at full dime. I've tried everything under the sun but today had a eureka moment and think this might work for your amp too.Ĭonvinced that it is blocking and/or crossover distortion after reading Paul Ruby's description, Zaphod's and other comments and the success I had on the Trinity with the Ruby mod, I read and read and then came across this tidbit in a thread at the music electronics forum My Trinity plexi buzz largely went away with the Ruby mod (still has a little but nothing like it was), but my Ceria-tone combo was much more stubborn. OK so I think I have this thing licked - Unimind I have a good suggestion
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