terry wrote:
On Sep 5, 12:24 pm, John Ferrell wrote:
On Thu, 30 Aug 2007 17:54:46 -0600, Jack Schmidling
wrote:

Is it convenience or the laws of physics that modulators are always two
tubes in push pull?
I have an extra 811 and socket and was wondering if there is a way to
use this to plate modulate my 811 cw transmitter.
pics of 811 project athttp://schmidling.com/radio.htm
js
Finding a plate modulation transformer may be the hardest part. They
have always been expensive.

Cathode modulation is my next choice with grid modulation as a last
resort.

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"

Screen grid modualtion it it was a tetrode PA! But the 811 is a triode
I think?

You can always grid modulate a triode tube. The results are similar to
screen modulation of a tetrode tube.