[Amps] Class A for AM

[KA5MIR]

Thank you, Tom, for that information.

Jeff/KA5MIR 

On Wednesday 15 November 2006 03:50, Tom W8JI wrote:
> That does not apply to the AF signal content, or modulation.
> It only applies to the RF waveform and even-order distortion
> products of the RF signal. Push-pull cancels the even
> harmonic distortion of the RF signal. With a  7MHz  signal
> it cancels the 14 MHz harmonic (and other even harmonics).
> It doesn't do anything for splatter or odd-order distortion
> of information on the carrier.
>
> Distortion of the audio and splatter is a result of the
> transfer function, or ratio of drive power to output power.
> Nothing else. Push-pull does not improve transfer function
> any more than a second tube in parallel would do. This is
> why linear BC transmitters don't bother with push-pull.
> (Transistor PA's often do, but the reason is most
> semiconductors cannot be paralleled easily for stability
> reasons. It isn't because of linearity or transfer
> function.)
>
> 73 Tom