Originally Posted by jefrs
I was quoting from data sheets for a single valve in Class A
6V6 wants Rk 232ohm at 250V and -12.5V on g1 for 5000ohm load
and Rk 317ohm at 315V and -13V on g1 for 8500ohm load
Typical p-p Rk is 225ohm for both [Radiotron]
6L6-GB wants Rk 167ohm at 250V and 14V (-ve?) on g1 for 2500ohm load
and Rk 218ohm at 300V and 12.7V on g1 for 4500ohm load [RCA]
Fyi my Epi BC30 uses a 250ohm Rk for both 6L6WXT+ running at 418VDC, values for p-p not being the same as SE.
Do you know an actual
guitar amp running 6V6 or 6L6 at such low voltages ?
Do you know an actual modern
amp built to run 6L6GB ?
These datas are just examples, that are useless under another voltage or with another load, you have to draw lines and make calculation, and always end up with very different values for different tubes.
Just look at my chart.
Your amp is a Push-Pull, not a SE, and actually your cathode resistor is a 500 ohms one for each tube.