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Re: [Amps] Testing Tubes with a Henry 2K

To: Brett Sims <>
Subject: Re: [Amps] Testing Tubes with a Henry 2K
From: David Gow <>
Date: Sat, 21 Aug 2021 19:40:39 -0700
List-post: <>
The Henry 2K series amplifiers have the filaments in series
so yuoust always have two tubes in the amp..  The manual explains why Henry
made this choice.  You can test a tube by having one known good tube in the
amp as a constant.  After done with the spare tubes put the best in the amp
instead of the original constant tube.  The measurements will be relative
but at least you have some indication of usefulness.  I love my 2K--3 but
to test tubes I use my SB-220 which has filaments in parallel

Dave W7VM

On Sat, Aug 21, 2021 at 7:24 PM Brett Sims <> wrote:

> I have three used 3-500Z tubes I'd like to test.  Can I safely test them
> one at a time in a Henry 2K?       My thought is this will allow me to
> better classify each tube individually and perhaps better match two of the
> tubes.  Providing the tubes prove useable.
> Not sure it matters, but the Henry has had the HV power supply upgraded
> with new electrolytic caps and the rectifier tubes replaced with high
> voltage "potted" diodes.
> Any thoughts or comments?
> Thanks  Brett  N5SQK
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