For the Rectos:
It's in the 12 to 25 mA area. It just depends on if you get tubes that are a little cooler or a little hotter. Also, it depends on what particular mode you're in...(Spongy/Tube, Bold/Tube, Spongy/Silicon Diode, Bold/Silicon Diode). It's pretty much the same amount of Cathode Current that 6L6GC's draw in their respective bias configuration.
Another thing about the Dual and Triple Rectos (Maverick excluded) is that the plate voltage is all over the place when you swap through the different modes. The plate voltage can vary from 350 to 475 or a little higher or lower depending on how hot or cool the tubes are and how much current is coming in from the wall. The varying plate voltage effects the amount of cathode current (bias). The EL34 and 6L6GC bias modes have different plate voltages as well.
As for the rest of the amps:
It's probably in the same area, if not cooler. I have no idea how high the bias is in the "class A" sockets of the Simul-Class amps.
Dale
