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I didn't say " a hair's width," I said "a hair," a technical term
understood by OFs as an approximation. I also didn't say "pinch the ribbon
cable," because that is not the side of the cabinet where the problem lies
in my experience.
Now, are you guys telling me there is an actual wing-nut on
"The KPA-500 transformer should be more than just a "hair" away from sides
(step 6 above) as there are rubber bumpers and a ribbon cable between that
should NOT be pinched. "
Over the production life of the KPA500 the transformer design, and perhaps the
supplier, have changed several times.
-- Forwarded message -
From: Mike Flowers
Date: Sat, May 29, 2021 at 11:11 PM
Subject: Re: [Elecraft] KPA500 cabinet buzz
Hi Mark,
I’d verify this with Elecraft Support.
When I got my KPA500 it was used and shipped with the transformer in a
separate box.
The assembly manual
The KPA-500 transformer should be more than just a "hair" away from sides
(step 6 above) as there are rubber bumpers and a ribbon cable between that
should NOT be pinched. Refer to Kit Assembly Instructions page 35 and figure
52.
Mike AC5P
On Sunday, May 30, 2021, 07:29:59 AM CDT, Eric
There is KPA500 buzz (normal), and KPA500 BUZZ (abnormal). I own two.
KPA Numero Uno was bought way back when, when the kits were first
available. When I first built it, it buzzed something akin to to your
teeth clacking when you notice a full-grown T. Rex is standing next to
you. At that
Mark:
I have this same issue with my KPA500,
connected to my K3S via AuxIO cable.
It's been that way since new from Elecraft.
It sounds like the AC transformer vibrating against the cabinet?
It's the same on different bands and power levels.
I've just never had the time to research the problem.
After much searching, this 2.4 year old thread is the only info I can find on
this issue. I bought a factory built KPA500 a few months ago and mine buzzes
on CW key down. Af first I thought maybe this is normal as I never owned an
HF amp. Now I think it is a problem.
Any know how to fix this? I
nal Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Michael Blake
> Sent: Thursday, January 25, 2018 5:50 PM
> To: Elecraft Mailing List <elecraft@mailman.qth.net>
> Subject: [Elecraft] KPA500 cabinet buzz
>
> I
iling List elecraft@mailman.qth.net
> Subject: [Elecraft] KPA500 cabinet buzz
>
> I just built my KPA500 today and on the air reports were good. 20watts Drive
> seemed right for about 500 watt peaks. After running it for about an hour I
> shut down to clean up the kit building mess and when
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Michael Blake
Sent: Thursday, January 25, 2018 5:50 PM
To: Elecraft Mailing List <elecraft@mailman.qth.net>
Subject: [Elecraft] KPA500 cabinet buzz
I just built my KPA500
I just built my KPA500 today and on the air reports were good. 20watts Drive
seemed right for about 500 watt peaks. After running it for about an hour I
shut down to clean up the kit building mess and when I returned later I was
hearing a loud 60 cycle mechanical buzz from the left side of the
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