[Elecraft] KPA1500 replacement devices

[Dynolab]

"Taming the stray (parasitic) R, L, and C can be quite challenging" is the
understatement of the century!
And then there is the heat issue!
I have been designing high power solid-state linear amplifiers since the
early 70s and have the greatest respect for anyone who has even the
slightest inkling of what it takes to design a reliable 160 thru 6 meter
high power linear!

73,
Hal
W7YNC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Brown
Sent: Wednesday, November 02, 2022 11:29 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA1500 replacement devices

On 11/2/2022 11:22 AM, Dynolab wrote:
> The ART1K6 looks like the best choice.

I'd be VERY cautious about replacing output devices in an amp that goes from
2 to 50 MHz. Taming stray (parasitic) R, L, and C can be quite challenging.
It took Elecraft's engineers a while to do that, and it was their job! One
of the guys who did it, K6XX, is my neighbor.

73, Jim K9YC
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