Wow, this is a REAL AMPLIFIER !!!!

[Rich Grise]

For ham radio we've used PL509 because the TV-version was much cheaper
and they had that coveted formal 30W plate dissipation rating. It also
allowed us to feed five filaments in series. Since that was 40V each we
could connect one PL500 (used to regulate the grid 2) in series as well
and got an almost perfect match to 230V.

My first novice transmitter used a Horizontal Output tube. (ca. 11960's)

Cheers!
Rich

 

[Rich Grise]

Glass envelope, air cooled, tungsten anode... Amateur.

Try this
http://www.cpii.com/docs/datasheets/78/4CM2500KG June 2011.pdf

If you can get over 100 A anode current through a vacuum tube, this is
quite extraordinary. For a mercury filled tube that is not too
spectacular.[/QUOTE]

Yeah, and the s/n ratio will be about 2 db. Ever heard of mercury hash?

They do make good ignitrons, however.

Cheers!
Rich