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Re: [Amps] Project for 8122 tubes

To: <>, <>
Subject: Re: [Amps] Project for 8122 tubes
From: "jeremy-ca" <>
Date: Tue, 14 Aug 2007 09:51:57 -0400
List-post: <>
The military used them at UHF in cavities.

You could also look at the various 4CX250 VHF/UHF Handbook and magazine amps 
for circuits. Then adjust RF circuitry for the different values of the 8122. 
The 4CX250 series screen ring capacitor, Johnson 124-113, fits the 8122. The 
8122 uses the same socket as the 8873, 8874, 8875, 3CX800 and is readily 
available from several amp manufacturers.

The 8122 has a very fragile screen. Use protective circuitry and keep the 
voltage at no more than 350 with a 2500V Ep. A Es of 300 is fine with a 2000 

The Johnson 6 and 2 Thunderbolt uses 4X150's and is a decent circuit to copy 
for a 2 band amp. The manual is on BAMA.

Ive used the 8122 for over 40 years and it is a good tube as long as care is 
taken to protect it.

National Radio 1963-69
Member NCL-2000 Design Team

----- Original Message ----- 
From: "sulai je" <>
To: <>
Sent: Tuesday, August 14, 2007 6:03 AM
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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