On Fri, 26 Mar 2004 12:53:53 +0100, George wrote:

U?ytkownik Finn S. Mikkelsen napisa?:

It's an American Model RCA 813A PA Tube.... Do you have the specs or
du you
have a URL from wich i could find that info, i would be very
gratefull....
813 = Russian GU13, look the
http://www.russiantubes.com/prop.php?t=8&p=175I

I think they are listing ratings quite a bit less than the US 813.
The plate dissipation is over a 100 watts and they list the output
power as 100 watts. (0.1 KW). Course they may be running class A. I
think the ones I've seen were rated at close to 3000 volts on the
plate and on the order of 250 to 500 watts out depending on class and
duty cycle. I used to run the legal limit with a pair in grounded
grid. (Yup, tetrode in GG G). You could darn near read a newspaper
from the light off the plats.

One of the locals just picked up a pair for $10 or $15 each. OTOH that
is about the cheapest I've seen them.

As others have mentioned I'd watch e-bay and see what they are going
for.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com


Good luck,
George SP2BRZ.