Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Electric I, Feb 5, 2008.
Do class a amps eat more tubes? Because they run hotter ?
And sometimes above them! My Palomino is idling at 13.5 watts dissapation with of coarse 12 watt tubes. Sounds good and I dont feel like replacing the resistor. I guess its tube life is going to be shorter than most! Bob
As usual, Randall Aiken has a great article on this. It will help to explain what plate dissipation looks like for different class amps.
Cathode biased tubes idle hotter, but when a signal is pushed trough them they actually draw less current. (Check it with an AC ammeter) Fixed, or adjustable bias with a grounded cathode draws more current when pushed with a signal.