Yes you can. You need to keep the drive way down and keep grid and plate
currents at half normal IF YOU CAN LOAD IT PROPERLY which is
questionable. I ran mine with one of the 3-400's dead without knowing it
during a contest. I didn't notice until I saw the power out was only
about 500w. As for the loading, maybe running on 20 into a dummy load
with around 40w drive will allow you to tune and load properly.
W1NR
On 8/22/2021 10:02 PM, Brett Sims wrote:
> 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
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
> 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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