New Revision of KPA500 LPF TR Switching Rework Rev. E

[Elecraft mailing list]

I have an early KPA500, and it works flawlessly.  Is this mod recommended by Elecraft on ALL amplifiers that presently have Rev. D ?  This mod requires considerable disassembly, and I don't want to do it unless it is highly recommended.  Please state the specific reason for this mod.  Thanks.  Roy Morris  W4WFB
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[Petr, OK1RP/M0SIS]

Roy,

The modification can be done as prevent action in order to avoid the loosing
the full power (12m) accompanied by burning smell or it can be the solution
for
your already ruined amplifier.

The typical KPA500 misbehavior sounds like it is arcing inside and smells
the
classic something is burning smell. The SWR LED's are dancing upwards as it
arcs. If you have connected the KAT500 tuner then it has the SWR around
1.3:1... and power is lost.



-----
73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt
--
Sent from: http://elecraft.365791.n2.nabble.com/
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[Lynn W. Taylor, WB6UUT-3]

Is this an official Elecraft modification?

On 9/27/2019 2:58 AM, Petr, OK1RP/M0SIS wrote:

> Roy,
>
> The modification can be done as prevent action in order to avoid the loosing
> the full power (12m) accompanied by burning smell or it can be the solution
> for
> your already ruined amplifier.
>
> The typical KPA500 misbehavior sounds like it is arcing inside and smells
> the
> classic something is burning smell. The SWR LED's are dancing upwards as it
> arcs. If you have connected the KAT500 tuner then it has the SWR around
> 1.3:1... and power is lost.
>
>
>
> -----
> 73 - Petr, OK1RP
> "Apple & Elecraft freak"
> B:http://ok1rp.blogspot.com
> MeWe: https://bit.ly/2HGPoDx
> MeWe: https://bit.ly/2FmwvDt
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> 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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[Buck]

I didn't see anything on the Elecraft support page about a mod so I put
in a ticket a few days ago inquiring about my KPA500 Serial 1503.  So
far, no answer.

Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 9/27/2019 11:38 AM, Lynn W. Taylor, WB6UUT wrote:

> Is this an official Elecraft modification?
>
> On 9/27/2019 2:58 AM, Petr, OK1RP/M0SIS wrote:
>> Roy,
>>
>> The modification can be done as prevent action in order to avoid the
>> loosing
>> the full power (12m) accompanied by burning smell or it can be the
>> solution
>> for
>> your already ruined amplifier.
>>
>> The typical KPA500 misbehavior sounds like it is arcing inside and smells
>> the
>> classic something is burning smell. The SWR LED's are dancing upwards
>> as it
>> arcs. If you have connected the KAT500 tuner then it has the SWR around
>> 1.3:1... and power is lost.
>>
>>
>>
>> -----
>> 73 - Petr, OK1RP
>> "Apple & Elecraft freak"
>> B:http://ok1rp.blogspot.com
>> MeWe: https://bit.ly/2HGPoDx
>> MeWe: https://bit.ly/2FmwvDt
>> --
>> Sent from: http://elecraft.365791.n2.nabble.com/
>> ______________________________________________________________
>> 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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[Petr, OK1RP/M0SIS]

Lynn, yes it is.
Elecraft parts kit: E850607

Petr



-----
73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt
--
Sent from: http://elecraft.365791.n2.nabble.com/
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