For a cathode biased 6v6 amp use 8K reflected impedance at 330-370V.Ī grid biased PP amp with 6l6GC tubes like the fender hot rod deluxe has a 4.25K OT according to classictone. Grid biased pp 6v6 amp use a 6.6K reflected impedance for max output at around 350-400V. Much lower than most 5e3.Īlso one thing to consider is that it is better to run the OT impedance a little higher with cathode bias. which is 11.82W total dissipation (plate and screen). With a 250 ohm bias resistor and a 25µf bypass cap you get 19V over the cathode resistor = 38mM total current on each tube.
That amps schematic shows a plate voltage of 330V and 300V on the screens. I would rather use a 14W 6V6-GTA in that amp than a weaker 12w 6V6-GT in that amp.Īn amp that runs the weaker 12 watt 6V6-GTA within specs are the Dearmond R15 (almost a 5e3 clone). Most people say that they should run with 365V plate and ~325V on the screens with the 5K dropping resistor and the 250 ohm bias resistor. and has a 10W 250r bias resistor with a 25µf bypass cap. That amps has a B+ of 395V (slightly lower on the plate due to OT resistance) and 370V on the screen with the use of a 2.5K screen dropper. Look at something like the Fender 5e5 pro. Sounded great and made around 30-32 strong clean watts. That ran the plates at 290V and the screens a little lower (282V) with a 56 ohm shared bias resistor bypassed by a large 470µf cap. No sense of going much higher than that in a cathode biased amp. for a 6V6-GT tube that is 350V plate and 315V screen voltage.Ī EL84 has a 300V plate/screen rating. In general do not exceed the datasheet values. If you go cathode bias on the output tubes, it is much better to go with lower voltage and more current.
0 kommentar(er)
