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@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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