Have a look at this:
<http://tinyurl.com/3v3cmkb>
A 1962 QST article by Ray Rinaudo which presents the design and construction of
very clean
4-125A and 4-250A amplfiers.
On 5/11/2011 7:44 PM, Robert Groh wrote:
> OK here I am really going to tempt the gods with a strange idea of a 'classic'
> medium power amplifier using one or two of my 4-125A tubes - HF, window in the
> front so I can watch the tube plate(s) glow, driven by a CE 20A exciter.
> Maybe
> just a couple of bands, maybe one band. Couple of ideas already in hand from
> past issues of QST (I haven't had a chance to prowl through the old
> Handbooks).
>
>
> So again I'm here with hat in hand - soliciting all thoughts on the idea (I
> already know there are many better tube choices today as well as solid state
> amplifiers but let's stick with the 4-125As). Pointers to reference articles,
> ideas, things not to do (again excluding the idea of NOT using a 4-125A!),
> etc.
>
> I would definitely provide warmup delay, adjustable (and monitored) filament
> voltage, cool down delay. Other protection? Really thinking about using it
> as a
> grid driven tetrode amplifier.
>
>
> 73
> Bob, WA2CKY
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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