"Richard Harrison" bravely wrote to "All" (28 Feb 05 12:09:32)
--- on the heady topic of " Say what you mean."

RH From: (Richard Harrison)
RH Xref: aeinews rec.radio.amateur.antenna:26155

RH When there`s no signal input to a Class A amplifier, its power input
RH is volts x amps and its efficiency is zero. Maximunm undistorted output
RH requires 1/2 the d-c input to the stage. As this power exits the
RH stage, it cools as the remaining dissipation is only 1/2 the no-signal
RH dissipation.

I'm sorry but it is an erroneous conclusion to think it cools. Don't
you recall mentioning that the "average" voltage and current remains
the same? On the contrary, the stage would generate a little more heat
due to the a.c. losses incurred from a small, but non-negligible,
amount of internal resistance. That is because this internal loss
behaves just like a small resistance in series with the source of emf.


RH An amplifier can be a linear source without operating under Class A
RH conditions.

I would really find it instructive if you finished up replying to this
message with an example of a "linear" source not operating in Class A?

A*s*i*m*o*v

.... As I suspected, you're a rank sentimentalist! --Cpt. Louis Renault