Re: Push Pull P-P Impedance

"Paul D. Spiegel" wrote:

> I can see where Ed is getting the quarter load from.  Both the _Radio
> Designer's Handbook_ and Terman's _Radio Engineering_ describe the slope
> of a composite PP class A triode load line as "...one fourth the
> plate-to-plate load resistance" (Ternan) "...corresponding to Rl'=1/4Rl,
> where Rl = load resistance plate to plate" (RDH).  The graphic examples
> in Ternan seem to support the 1/4 primary load.

The load for one tube whilst in class A is 1/2 the RLa-a.
Whilst in class B, the load is 1/4 RLa-a.
The load seen by one tube in a class AB amp varies from 1/2
to 1/4 RLa-a during a full power cycle, and the load line appears as a curve

across the data curves.

Patrick Turner.