8122 tubes were used in a few amplifiers but not not many. They were an
inexpensive solution for mobile amplifiers and for some larger amplifiers.
They are very similar to 4cx250F tubes but have a somewhat hard to get socket.
They often needed to be matched when used in pairs and RCA would color code
them just for that reason. EIMAC made a few using their 4cx250B design and they
did not need matching. Their product was very consistent. But they did not make
them . I would start with a amplifier design for a 4CX250 and use the proper
bias and plate voltages for the 8122. You may for a design for a 8072
conduction cooled tube. There were some UHF repeater amplifiers using them. The
8072 is a 8122 without fins. I have disassembles several old amplifiers to
recover their 8072s
73 Bill wa4lav
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
sulai je [7z1sj@jeeran.com]
Sent: Tuesday, August 14, 2007 6:03 AM
To: amps@contesting.com
Subject: [Amps] Project for 8122 tubes
Hello
I had some RCA 8122 tubes in my junk box since long time. Thinking to use them
in a homebrew project so I start to search for an amplifier project! Either to
UHF or VHF . HF Googling the net yields a zero project for those tubes.
if any on can help with schematic and more info I will be appreciated in
advance .
73s de 7z1sj Sulaiman
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