Class A Amps - Harder On Tubes ?

rockon1

Platinum Supporting Member
Messages
13,703
...because they're CONTINUOUSLY operated closer to/right at the tubes' MAXIMUM dissipation rating.


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
 

booj

Member
Messages
172
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.
 




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