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

[Robrk]

Think the sockets are the same, leave room and 4-250/s or 4-400 can plug in with the same screen and bias volts.




On May 11, 2011, at 22:44, Robert Groh <rgroh at swbell.net> 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
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