[Top] [All Lists]

Re: [Amps] Project for 8122 tubes

To: "" <>,"" <>
Subject: Re: [Amps] Project for 8122 tubes
From: "Fuqua, Bill L" <>
Date: Tue, 14 Aug 2007 09:23:09 -0400
List-post: <>
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: [] On Behalf Of 
sulai je []
Sent: Tuesday, August 14, 2007 6:03 AM
Subject: [Amps] Project for 8122 tubes

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
Amps mailing list
Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>