[Elecraft] KPA500 and KAT500 for sale

[radiodaveaz at earthlink.net]

My shack is wired with the following:

1x 120 VAV 15 amp
1x 120 VAC 20 amp
1x 240 VAC 20 amp

I run the K3 and my radio equipment on the 120 VAC 20 amp circuit and the
AL-80B amplifier on the 240 VAC 20 amp circuit.

I run my computer and other stuff on the household 120 VAC 15 amp circuit.

I downsized from my antenna farm, and I had a license electrician wire a
bedroom (radio room now) with the 120 / 240 VAC 20 amp outlets.

73 to all,

Dave Tulloss K7DRT
Tucson, Az.





-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Jim Brown
Sent: Saturday, May 31, 2025 12:53 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA500 and KAT500 for sale

On 5/31/2025 11:33 AM, Bob McGraw wrote:
> However, should the amp be powered from residential electrical outlets 
> where there are usually 4 or 5 on the same circuit and using the 
> stab-in connections, the 120V voltage drop may be excessive under full
load.
> The amp should not display the HV to be less than 60 volts at 500 
> watts output.

Bob's advice is right on! It's simple Ohm's law to run beefy copper for
circuits that will run big loads. My shack is wired with two #10 120V/20A
circuits and a single 240V/20A circuit.

The KPA500 HV transformer is tapped to adjust for these issues. It's quite
simple to adjust -- open the top cover and change a push-on jumper, per the
manual. For almost ten years, we've run two KPA500s from one or two Honda
2000i or 2200i generators. For CW, we need to back off the power to 300-350W
to run from a single gen, but can run full power from two of the generators
sychronized together with the Honda kit.

If one of the stations is SSB, we can run close to full power from one
generator. They're running on 120VAC. We DO run beefy copper from the
generator(s) to the amps.

73, Jim K9YC
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