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

To: <>, "Mike McCarthy, W1NR" <>
Subject: Re: [Amps] Testing Tubes with a Henry 2K
From: "Carl" <>
Date: Sun, 22 Aug 2021 10:52:28 -0400
List-post: <>
He may be thinking of the Kenwood TL-922


----- Original Message -----
From: "Mike McCarthy, W1NR" <>
To: <>
Sent: Sunday, August 22, 2021 7:58 AM
Subject: Re: [Amps] Testing Tubes with a Henry 2K

Well... My 2K (original) is wired in parallel. It is also designed for
3-400's and won't accept a 3-500 unless you change the chimneys and
change the heat dissipation caps to low profile ones or lower the sockets...

Mike, W1NR

On 8/21/2021 10:40 PM, David Gow wrote:
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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