On Saturday, November 11, 2017 at 1:07:24 PM UTC-7, wrote:
On Thursday, October 15, 2009 at 11:24:01 AM UTC-4, Steve wrote:
A while ago I bought a homebrew amp (80-10 meters) that uses
a single 833A tube. Its beautifully built. So far I have not been
able to find any plans or schematics for an amp that uses this
tube. Has anyone seen an article in QST, Ham Radio, or other
magazine of an amp using an 833A? No luck with a web search.
TIA
Steve W6SSP
p.s.-it has a tuned grid circuit

1980 handbook Page 6-46 Chapter 6 Has a 833A in an amp.

Thank you. I have been in the process of building an 833A amplifier for 20 meters and I do have it working but I sure would like to see another builders ideas. Mine is grid driven with about -90 volts on the grid. I get 800 watts output with 3KV under load. I believe the plate current is just over 400 mA and a grid current of just under 50 mA if I remember correctly while writing this with an efficiency of about 63% which I consider OK. I will try to locate this article and if I cannot find it may just purchase the 1980 book from Ebay. 73 WA4QGA El Paso, TX

wrote:

Thank you. I have been in the process of building an 833A amplifier for 20 =
meters and I do have it working but I sure would like to see another builde=
rs ideas. Mine is grid driven with about -90 volts on the grid. I get 800 w=
atts output with 3KV under load. I believe the plate current is just over 4=
00 mA and a grid current of just under 50 mA if I remember correctly while =
writing this with an efficiency of about 63% which I consider OK. I will tr=
y to locate this article and if I cannot find it may just purchase the 1980=
book from Ebay. 73 WA4QGA El Paso, TX

A lot of broadcast transmitters used the 833, and schematics for them should
be easy to find. Bauer 707, Gates BC1G are the first that come to mind.
Some others just uses 833s in the exciter deck to modulate larger finals.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."