Richard Clark, KB7QHC wrote:
"However, I would be surprised if a practical common Amateur grade
transistor model transmitter commonly available for more than 30 years
now has any configuration that does not supply voltage directly to the
final transistors---."

My Kenwood TS-130S manual has specifications on page 2. Transmitter
output impedance is specified as: 50 OHMS!

Om page 30 is a level diagram. Output from the transmitter`s low-pass
filter is measured as 70.7 volts at 14.25 MHz, which is 100 watts into
50 ohms (square root of PR).

D-C power is fed to the center-tap of a push-pull output transformer to
the final transistors.

From the specifications page also, the power reguirement is TX: 18A
13.8V DC. It`s a linear amplifier. Only 40% efficiency. The designer
probably was more interested in low harmonics than efficiency. The final
by itself only takes part of the 18A ao its efficiency is more than 40%.

Kenwood says its transmitter presents an impedance of 50 ohms at its
"OUT" terminals in the diagram on page 30. 100 watts at 70.7 volts.

Best regards, Richard Harrison, KB5WZI