Greetings,
I'm a new subscriber to this reflector, but have been an occasional
reader of the digests. I'm also a relatively new amplifier owner,
finally getting a used SB-220 a couple of years ago. I am, however, a
long time amp user, courtesy of contests stations that I have
frequented.
Over the course of my amateur career, I have, like many of you,
accumlated some parts and goodies in my junk box. I am at the point of
seriously considering 'rolling my own' mf/hf amplifier.
I come seeking some advice and/or opinions on this subject. Here is
what I have:
* Five 4-PR400A's (pulse rated 4-400A)
* Two sockets
* Filament xfmr
* A couple of big breadslicer air variables
* Chassis, etc.
The power supply and rest are not a problem. Plenty of ideas from ARRL
Handbook.
My requirements are:
* 160 to 10 meter coverage
* As much power out as possible from either 2 or 3 of the tubes
* Stable operation
I operate 99.9% cw. I am considering a Class C only machine for
efficiency. I have examples in the common amateur literature of using a
pair of 4-400a's in gg, but they are not Class C.
Can anyone enlighten me on the perils of building and operating a grid
driven Class C mf/hf amplifier?
What are the benefits, besides efficiency?
I'm familiar with the "tune for max smoke" approach with the gg amps.
Does this approach apply with
Class C amps, or is the old "dip and tune" approach used?
Any and all input greatly appreciated!
Vy 73,
Charlie N9CO
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