[Amps] Linearization problem

[KA4INM radio]

On 12/04/14 09:05, Manfred Mornhinweg wrote:

> When this contraption is driven by a SSB signal, the bias control
> circuit will at all times apply such a bias voltage that the output
> amplitude remains very highly proportional to the input amplitude. The
> amplifier will move through several operation classes, from class A at
> extremely low signals, over class AB, right into non-saturated class C
> where it will stay over most of its dynamic range, and moving into class
> E at the highest amplitude levels.  The result will be very good
> amplitude linearity, along with pretty good average efficiency over the
> entire dynamic range. I expect something like 60% average efficiency in
> SSB, compared to 20% or so for conventional linear amps.

> Now the question: How can I get an undistorted sample of the drive
> signal, for my input-side envelope detector?

   Simple; Dougherty amplifier.  Two tubes one class "C" (positively 
modulated) the other class "A" (negatively modulated) many variations exist.
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.