On Mon, 24 May 2010 16:15:52 -0700 (PDT), Keith Dysart
wrote:

I have looked for such a simple explanation in the circuits of the
transmitters used in the experiments but was not able to find one.
So I am still puzzled by the observations.

Hi Keith,

Consult Terman. That should be sufficient for both the instructor and
the student to use as a benchmark design for tubes, at least. The
design of the transistorized finals' deck of Ham grade HF rigs has
been stable for nearly 4 decades.

Any departure from HF Ham grade equipment capable of 100W is going to
lead to equivocal statements.

73's
Richard Clark, KB7QHC