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

["Fuqua, William L." <wlfuqu00@uky.edu>]

Two things to watch out for.
The 4-400A tubes are taller than the 3-500Z. Watch out for plate leads getting 
too close to top shield and the chimneys are too short. You could set the 
chimneys aside and use small fan to provide some cross air flow to plate 
terminals.
  Also, the input impedance will be slightly different.
However, conversion should be possible.

73
Bill wa4lav
________________________________
From: Amps <amps-bounces@contesting.com> on behalf of gudguyham via Amps 
<amps@contesting.com>
Sent: Tuesday, January 26, 2021 3:48 PM
To: Robert W5AJ <woodr90@gmail.com>; Amps@contesting.com <Amps@contesting.com>
Subject: Re: [Amps] AL82 3-500 4-400

CAUTION: External Sender


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.


Sent from the all new Aol app for iOS


On Tuesday, January 26, 2021, 3:35 PM, Robert W5AJ <woodr90@gmail.com> 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
AL82

Have fired up filaments in AL82 (no HV)



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



73 W5AJ







Robert

Midland, Texas

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