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

[Dave M]

sounds like a fun project and Ham radio homebrewing at its basics , using what you have on hand to make the best possible . besides those 4-125's will look a helluva lot better glowing in a case than sitting in a box :)

......................................................................................................
 
73     VE3DV , Dave



 

> Date: Wed, 11 May 2011 19:44:10 -0700
> From: rgroh at swbell.net
> To: amps at contesting.com
> Subject: [Amps] Question #2: 4-125A linear amplifier
> 
> 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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