[Amps] FW: FW: Air temps leaving the amp

[Steve]

I'd say you were right first time - 8877 has a heater (to heat up the 
cathode), 3-500Z has a filament, like a light bulb.

Steve

Matt wrote:
> Yes - 8877 (not 8873) and yes I was using slang (heater) when referring to
> the filament.