[Boatanchors] Suppressor grid modulation

[w8au at sssnet.com]

At 11:03 PM 1/27/2010, Jim Haynes wrote:
>On Wed, 27 Jan 2010, Al Klase wrote:
>
> > In addition, you need a pentode with the suppressor grid brought out to
> > a separate pin, as opposed to being internally connected to the cathode.
> >
>This ticked a faint memory of some article about tubes, 807 or 1625,
>and in some brands there was something connected internally, but in
>others there were two separate wires going to the same pin on the base.

This discussion accounts for the efficiency modulation techniques used by
Navy WW2 gear where the TDE and earlier xmtrs using 803 tubes used suppressor
grid modulation, and the later TCK, using a pair of 813's, used control-grid
modulation.  Although the 813 was the successor to the 803, the suppressor
grid vs. beam forming plates was a definite change and required a change
in the modulation arrangement.

Perry  w8au