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Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ?

Subject: Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ?
From: Jim Brown <>
Date: Sun, 29 Apr 2012 10:47:57 -0700
List-post: <">>
On 4/29/2012 8:27 AM, W2XJ wrote:
> The only amatuer solid state amplifier I like to date is the Tokyo
> HIpower 2.5K but even it gets hot when running the full limit with
> PSK31.

The relatively new Elecraft KPA500, specified at 500W ICAS, doesn't go 
out the door unless it makes 600W on 160M-6M, and it's happy running 
600W into a matched load with keydown modes.  I run it that way on 6M 
with  FSK441 and ISCAT, and on the HF bands for RTTY contesting.  It's 
got the protection and careful thermal design required, will run at full 
power to about 1.5:1, back off a bit for 2:1.  Yes, it needs a tuner for 
mismatched loads.  It sells as a screwdriver kit for $2K.  Two of them 
bridged would be 1200W, only a dB below legal US power into a matched 
load.  I'd love to see that be their next product once they get their 
high power antenna tuner in production.  So would my neighbor, K6XX, who 
is the mfg eng'r responsible for the KPA, the KX3, and the tuner.

I've not given any thought to selling my Titans, but I only use them for 
contesting.  The instant-on KPA500 is enough for most DX chasing, saves 
the filaments on my Titans, as well as the $0.35 per kWh that it takes 
to heat them.

73, Jim K9YC
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