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Re: [Amps] Advice needed for SS amp

Subject: Re: [Amps] Advice needed for SS amp
From: Paul Decker <>
Date: Thu, 6 Jun 2013 11:04:56 +0000 (UTC)
List-post: <">>

I bought a rack mount assembly which has 6 - 50v @ 50 A supplies in it.  3 x 3 
in parallel.   I only need to run one for legal limit.

As far as heat removal, it's not too difficult of a problem to solve with 
attention to detail.   I've long said, and been long shot down, that there 
isn't much difference between tube cooling and ss cooling.  If you look at a 
3cx800, most of the tube is actually the "heat sink"  The ceramic part of the 
tube isn't really much bigger than a transistor, it is just shipped with it's 
cooling mechanism from the factory.  For solid state, it's up to you to build 
that cooling yourself.

With 1 x BLF578XR you can easily run 1200 watts at 144 MHz.  Is it 
"continuous"?   I haven't tried it, but 1"15' off and 45' on for wsjt it runs 
fine for hours.

With 2 x BLF578XR you can easily run 1500+ watts at 144 MHz and use "forced" 
air cooling with an array of muffin fans.   If you wanted, there is no reason 
you couldn't you a big blower to move even more air.


Date: Wed, 5 Jun 2013 22:20:47 -0700
From: Richard Solomon <>
To: "" <>
Subject: Re: [Amps] Advice needed for SS amp
Content-Type: text/plain; charset=ISO-8859-1

As far as the Power Supply goes, there are still a lot of server supplies
there that deliver ~ 50 vdc @ ~ 50 Amps. Put a pair in series and you have
some serious power.

73, Dick, W1KSZ
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