[Amps] Testing Tubes with a Henry 2K

[Carl]

He may be thinking of the Kenwood TL-922

Carl


----- Original Message ----- 

From: "Mike McCarthy, W1NR" <lists at w1nr.net>
To: <amps at contesting.com>
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 <brett at simsranch.com> 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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