[Boatanchors] 813 grid to filament short

[Sheldon Daitch]

Bob,

Terman is up to the challenge.

My 1955 Terman's Electronic and Radio Engineering, Fourth Edition, page 530, chapter 15, section 2, in the miscellaneous aspects of plate-modulated Class C Amplifiers, and tubes typically used:

"Plate-modulated Class C amplifiers normally employ the same triode, beam, and pentode tubes that are used for ordinary Class C amplifiers.  However, the rated d-c plate voltage and carrier power of a tube used for plate modulation are less than the corresponding ratings of the same tube when used as an unmodulated Class C amplifier.  This is because at the peak of a completely modulated wave, the equivalent plate-supply voltage applied to the tube is twice the d-c value, and the power output at modulation peaks is four times the carrier power.  However, the tube operates at these peak values for only a small fraction of the time, and the average power power output generated under fully modulated conditions is 1.5 times the carrier power."

Also see:

http://www.w8ji.com/amplitude_modulation.htm

and

http://www.pa2old.nl/files/am_fundamentals.pdf


73
Sheldon
________________________________________


So there is NO possible way to get 1500W from 562.5W.  I don't care what
you use in terms of fantasy land assumptions of 100% efficiency.

Every transformer mounted on a pad or a pole has an impedance stamped on
its dataplate.

This dictates loss.

Wikipedia is notorious for erroneous postings/listings.

May just as well quote Facebook.  Try Terman's!

N0DGN