Hello Carl,
You wrote 5 января 2013 г., 22:30:46:
It only has a 500W anode dissipation altho without forced air cooling.
Sockets arent that common and look poorly made?
Very similar to the QB5/1750 which conveniently fits a 4-1000A socket and
are often available in the US as a few BCB transmitters used them.
The GU-81M is also similar, and sockets seem to be more available but
expensive.
They all make excellent AM modulators (-;
Carl
KM1H
Thank you for very useful notes. GU46 were rare used here because of
we good choice of another cheap tubes. I know a few designs with
1-2pcs of GU46, 1 tube is able run 500-1000W, but better 500W for its long
life. It is not a big problem to find these tubes here, but sockets is
not easy to find. Local people try to make these sockets, they are not
masterpiece of course, but they work.
GU81m can be used of course, it is cheap, its socket is not a problem
(my socket cost $35ea,I think it is not expensive). Sometimes it is
used without original electrodes,this make it much compact. You can
watch plenty of pictures GU81m with sockets and without electrodes if
you google GU81m and then open the first topic.
Dr Alex Gavva QRO Parts Site: http://www.ur4ll.net
UR4LL
KO70XG mailto:ur4ll@ur4ll.net
Thanks for the reply Alex. I already have a pair of NOS GU-81M's and used
sockets via friend who picked them up at Friedrichshafen and shipped to my
son who was stationed in Germany and then via APO to me. They are currently
modulating a 4-1000A.
That same son will be flying to Kiev in a week for about 5-6 weeks, then to
Moscow for 2-4 weeks and then Tiblisi for a 18 month or longer US Embassy
assignment. Possibly he can contact you and do some shopping for me.
Diplomatic mail is cheaper than the direct way by far (-;
He speaks, reads, and writes fluent Russian and has a MSEE degree but
understands little about vacuum tubes except those in his custom guitar
amps.
Carl
KM1H
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