Alex,
A light weight single band amp has already been done. Check the Jan/Feb 2006
issue of QEX on page 41,
Dick, K5AND, describes a 6 meter, 8877 amp that he developed that uses an
existing commercially available HV switching power supply that will put out
1.5 KW on 6 meters. The total weight (amp and power supply) was 20 pounds.
73, Harry, W3IIT
----- Original Message -----
From: "Alex Malyava" <alex.k2bb@gmail.com>
To: <amps@contesting.com>
Sent: Friday, September 14, 2007 1:34 PM
Subject: [Amps] switching power supply for tube amplifier
> Hi,
>
> After reading discussions of "light and powerful PA for expeditions" at
> Russian website (cqham.ru) I got this crazy idea of using switching power
> supply in it.
>
> What options we usually have - it is either 20-30 ponds of transformer or
> we
> do AC rectification along with voltage multiplying. That might be good in
> EU
> or some location with 220V, but here, in 120V-land we end up with way too
> many stages of voltage doubling...
> That made me thinking about switching power supply. We do have 200W PS in
> our radios or next to it working just fine. So, why not to make 1000V 1A
> PS,
> or something like that?
> Assuming that the amp is for expedition, and suppose to be small and
> light,
> I think it can be something like 500W out based on one (or two small)
> tube... If making 1500-2000 plate voltage is scary we can look for
> low-voltage tubes if there are any.
> I am pretty sure that regardless how bright your idea is it was already
> invented by somebody else, tried and buried :)
> It might be long time ago and current technology gives us some powerful
> switching FETs we didn't have 10 years ago...
>
> Am I totally wrong and don't know what I am talking about?
>
> Alex K2BB
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