Sorry, the 2K-2 on BAMA with 3-400Z tubes shows series filaments.. I don't
have the original 2K manual and made an assumption.
Dave W7VM
On Sun, Aug 22, 2021 at 4:58 AM Mike McCarthy, W1NR <lists@w1nr.net> wrote:
> 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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