Appreciate the responses. My Henry 2K also has the filaments in parallel.
Your right, it was originally designed for 3-400's. I failed to mention in my
original post, it was upgraded to 3-500's with appropriate chimneys and caps.
It works great.
So if you have a Henry 2k with filaments in parallel and currently runs two
3-500Z's with appropriate chimneys, could one test a single tube? Wadda ya
think?
Thanks Brett N5SQK
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Date: Sun, 22 Aug 2021 07:58:30 -0400
From: "Mike McCarthy, W1NR" <lists@w1nr.net mailto:lists@w1nr.net >To:
amps@contesting.com mailto:amps@contesting.com
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 you must
> 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
>
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