Automatic increase of plate, load power supply when more power output is needed from an electron tube

Not sure yet.


Plate voltage automatically increases when more music volume is wanted from a class A amplifier (electrons flowing all the time).


See previous posts.


Power consumption from power supply is the same. But electron tube life must be increased.



Exactly the opposite from class B amplifiers.


Electron tubes signals to the power supply that the listener wants the music louder and power supply increases voltage supplied to electron tube anode.


Not sure yet if music does become louder but clipping is prevented.


Since a class A amplifier cools when more power is supplied to the load it may be that the extra supply power is going to the load rather than plate dissipation heat to electron tube.


Why does an electron tube or transistor heat up anyway. On electron tubes it is electrons running very fast colliding with anode losing their kinetic energy to heat. Ie anode molecules become thermally faster vibrating.


Is this trick taking place on Neumann U47 too? See 30KΩ resistor in series with power supply:
http://downloads.bbc.co.uk/rd/pubs/reports/1954-23.pdf