On Tue, 25 May 2010 08:30:30 GMT, Owen wrote:

If the circuit is not linear in those terms, then you cannot form a
valid Thevenin equivalent circuit, and discussion of the Thevenin
equivalent series source impedance is a nonsense... it cannot be used.

The counter argument, as I understand it, is that the tank circuit
isolates the linear from the non-linear, and that the tank also
performs the action of transformation. Thus the proposal is an
analysis of their combination (I had to struggle to avoid
superposition).

Thus, the non-linear Tube (because, I presume, the circuit is in Class
C operation) exhibits a higher efficiency than would be found in a
resistance matched system. What I call the resistance matched system
is the unfortunate appeal to a source "resistance" equaling the load
"resistance." Thevenin/Norton do not mandate resistors, rather
impedances.

What I understand, comes from lengthy emails with multiple
contributors in years past: Walt and Richard being two of them. My
saved mail only goes back nine years, so the other two contributors'
names are lost to me right now.

Of course what I "understand" may be wholly misrepresented by my
exposition here. So be it. The source authorities can correct my
deviations.

73's
Richard Clark, KB7QHC