[Amps] Question #2: 4-125A linear amplifier

[Roger (sub1)]

On 5/11/2011 10:44 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).
>
>

Too bad you aren't closer.  I have the remnants of the RF deck for a 
2-meter amp (GE I think) that uses a pair of 4-125s you could have, but 
I don't want to ship it.  Sockets and tuned lines.

73

Roger (K8RI)

> 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
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