[Elecraft] KPA100 Rev D

[Don Wilhelm]

Syd,

If your KPA100 has red toroid cores at L15 and L16, install KPA100UPKT. 
  That kit will upgrade any level KPA100 to the latest.  If you do not 
have a shield over the speaker magnet, add the KPA100SHLDKT as well to 
upgrade your shield.

Those mods will add significantly to the stability of the amplifier, and 
I highly recommend them.
Those mods were specifically created to address a tendency to oscillate 
a little above the 40 meter ham band under some conditions.  If you 
operate with an autotuner  that tendency to oscillate is quite high.

73,
Don W3FPR

On 3/31/2012 4:17 PM, Syd Smith wrote:
> I recently became aware of the Rev D upgrade kit for the KPA100 at
> Elecraft.  Where can I find a description of the changes and a
> recommendation of why I would want to install this kit in my Rev A
> amplifier which works FB.
>