[Elecraft] IMD and supply voltage

[Doug Turnbull]

Frank,
     Maybe when the devices come out Elecraft will bring out a new power
amplifier module to replace the older module for both K3 and KX3.
Meanwhile run the K3 at lower power and drive an external vacuum tube or
solid state power amplifier.

      My experience of an Acom 2000A, a tube amp and an SPE Expert 2K-FA, a
solid state amp is that:
1) Solid State amps are instant on and this is a big plus.
2) Solid State amps do not heat the shack to the same degree.
3) Solid State amps are much more particular as to load and if the SWR is at
all high without being tuned out by matching the load then distortion is
horrific. 
4) The Acom 2000A is much more tolerant of operating for long periods flat
out at 1500 Watts.

      Of course this is a comparison of these two amps.   Please note that
1500 Watts is only used for contests which we are allowed to use for some
contests in EI but not for regular operating where our power limit is 400W
output.

                73 Doug EI2CN

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of frank
Sent: 29 October 2015 23:42
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] IMD and supply voltage

On Thu, 29 Oct 2015 15:21:05 -0700
Wayne Burdick <n6kr at elecraft.com> wrote:

> Yes, we made sure compression was off. We gave the unit every opportunity
to exhibit magic properties. Alas, it did not. 
> 
> Wayne
> N6KR
> 


Sounds like all solid state amps offering more than about 50 watts are
having growing pains.  It does not make much sense investing in something
you might need to trash in a few years when someone decides to design a
decent solid state amp or the chip designers create a magic power device.

For my money its a K3S/10 and a homebrew 6146 run off a mobile power supply.

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