Re: [Elecraft] KPA500 cabinet buzz

2021-06-01 Thread Mark Adams
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Re: [Elecraft] KPA500 cabinet buzz

2021-05-30 Thread Eric Norris
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

[Elecraft] KPA500 cabinet buzz

2021-05-30 Thread Andy Durbin
"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.

[Elecraft] KPA500 cabinet buzz

2021-05-30 Thread Richard P McCoy
-- 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

Re: [Elecraft] KPA500 cabinet buzz

2021-05-30 Thread Mike Maloney
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

Re: [Elecraft] KPA500 cabinet buzz

2021-05-30 Thread Eric Norris
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

Re: [Elecraft] KPA500 cabinet buzz

2021-05-29 Thread Richard P McCoy
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.

Re: [Elecraft] KPA500 cabinet buzz

2021-05-29 Thread k2qo
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

Re: [Elecraft] KPA500 cabinet buzz

2018-01-26 Thread Chris Hallinan
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

Re: [Elecraft] KPA500 cabinet buzz

2018-01-26 Thread AE0MM via Elecraft
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

Re: [Elecraft] KPA500 cabinet buzz

2018-01-25 Thread Dave AD6A
-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

[Elecraft] KPA500 cabinet buzz

2018-01-25 Thread Michael Blake
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