KPA500 Assembly Help

[Phillip Zminda]

I am nearly done building my KPA500 kit but not clear about one part of mounting the transformer. It came with 2 thin rubber disks and 2 thicker ones wrapped with the metal disk. The instructions call for 3 disks on the bottom and one on top. Do I put 2 thick and one thin on the bottom with a thick one on top? It isn’t clear to me from the manual. Since it’s Saturday I wouldn’t expect an answer if I called or emailed support Elecraft today.

Thanks,

Phil N3ZP
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[Elecraft mailing list]

Ah, but you came to the right place to get an Elecraft answer!

Use the two thick ones on the bottom plus one of the thin ones, then use a thin one on top. They are meant to reduce vibration, and thus hum when transmitting.
Enjoy your KPA500, and if you have more questions, just ask!

73,
Jack Brindle, W6FB
Elecraft Engineering

> On Jan 26, 2019, at 8:52 AM, Phillip Zminda <[hidden email]> wrote:
>
> I am nearly done building my KPA500 kit but not clear about one part of mounting the transformer. It came with 2 thin rubber disks and 2 thicker ones wrapped with the metal disk. The instructions call for 3 disks on the bottom and one on top. Do I put 2 thick and one thin on the bottom with a thick one on top? It isn’t clear to me from the manual. Since it’s Saturday I wouldn’t expect an answer if I called or emailed support Elecraft today.
>
> Thanks,
>
> Phil N3ZP
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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[Bob McGraw - K4TAX]

There is NOTHING like getting automatically an answer from the company
and the person that designed the amp........on a Saturday morning!   
Thanks Jack.

73

Bob, K4TAX



On 1/26/2019 10:56 AM, Jack Brindle via Elecraft wrote:

> Ah, but you came to the right place to get an Elecraft answer!
>
> Use the two thick ones on the bottom plus one of the thin ones, then use a thin one on top. They are meant to reduce vibration, and thus hum when transmitting.
> Enjoy your KPA500, and if you have more questions, just ask!
>
> 73,
> Jack Brindle, W6FB
> Elecraft Engineering
>
>> On Jan 26, 2019, at 8:52 AM, Phillip Zminda <[hidden email]> wrote:
>>
>> I am nearly done building my KPA500 kit but not clear about one part of mounting the transformer. It came with 2 thin rubber disks and 2 thicker ones wrapped with the metal disk. The instructions call for 3 disks on the bottom and one on top. Do I put 2 thick and one thin on the bottom with a thick one on top? It isn’t clear to me from the manual. Since it’s Saturday I wouldn’t expect an answer if I called or emailed support Elecraft today.
>>
>> Thanks,
>>
>> Phil N3ZP
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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[Phillip Zminda]

Thanks for quick reply. This is the reason I have always enjoyed owning Elecraft products.

73,

Phil N3ZP
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[ANDY DURBIN]

"The instructions call for 3 disks on the bottom and one on top."

I had the same question when I built mine.   I think I put 2 on bottom and 1 on top.  Even that is tight for the bolt length.   Elecraft actually has a mod kit with a longer bolt and more rubber discs.  I don't know why that is not included in the kit.

You should read the Elecraft paper on hum mitigation for more discussion on rubber discs and bolt length.  Get it from Elecraft or email me and I'll forward it.

Andy, k3wyc


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