I have a 70s Twin Reverb/Dual Showman amp that is just way too loud... ...so thinking that I'll plop some 6V6s in it. I'll know I'll need to change the bias resistor to enable a bias point of about 9 watts per tube. RCA Receiving Tube Manual, RC-22 has these tubes Max values as shown: Plate = 350 volts Screen = 314 volts PlDiss = 14 watts So, with this twin having 410 V on the B+ any thoughts to using the following tubes? BlackPlate RCAs Mazda NOS JJ 6V6s Anyone have an Idea about cathode biasing these? I would use separate pairs or break them down as: 1 cap/resistor 4 tubes 2 caps/resistors 2 tubes 4 caps/resistors 1 tube (4x) This might be an interesting project for the Guitar Amplifier Magizene. Thanks.