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Re: [Amps] AL82 3-500 4-400

To: Robert W5AJ <>, <>
Subject: Re: [Amps] AL82 3-500 4-400
From: gudguyham via Amps <>
Reply-to: gudguyham <>
Date: Tue, 26 Jan 2021 20:48:50 +0000 (UTC)
List-post: <>
4-400 tube will work in an Al82.  No problem.  They will have less gain and 
less output but you’ll get power.  You’ll do better if you use less bias.  Use 
it in SSB mode to up the idle current.  There “may” be an input matching issue 
but it shouldn’t be really bad.

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On Tuesday, January 26, 2021, 3:35 PM, Robert W5AJ <> wrote:


Have Ameritron AL82 amp, No Tubes 

Have extra Eimac 4-400 tubes 


Looked at some amp's schematics for 4-400 and appears these would work in

Have fired up filaments in AL82 (no HV) 


Any one tried this or have go/no go thoughts?


73 W5AJ





Midland, Texas


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