[Elecraft] KPA100 SSB power control

[Don Wilhelm]

Trevor,

If your R19 and R20 resistors have a reddish/brown body, you can leave them
in place - those are the good ones.  The potentially bad ones are the light
blue bodied resistors, and not all of those are inductive, but it is easier
to just call for replacing them than to explain which ones might be bad.
Inductive resistors were shipped with KPA100s and upgrade kits during the
summer of 2006 - the resistor vendor changed to an inductive design without
notifying Elecraft.

73,
Don W3FPR

> -----Original Message-----

>
> Thanks for the reply Don, much appreciated.
>
> Just to clarify, I built up the amp last year but never got
> around to installing it. So
> around December 06 I obtained the upgrade kit and installed that
> as well and that's
> how things stand at the moment.
>
> However your reply and mention of the new C31 had me looking around the
> Elecraft site and I see that there is an errata dated 4 December
> 06 which stresses
> the importance of changing R19 & R20 even though the correct
> values may already
> be installed - needless to say when I did the upgrade I followed
> the original
> instructions which basically says (on page 4) if the correct
> value components are
> already installed go to the next section.
>
> So, the upshot is, that I need to strip down the amp, replace R19
> & 20 with the low
> inductance type, check the other components in accordance with
> the latest errata
> and install a new C31. At which point I should be in a position
> to check out the amp
> properly.
>
> 73 to all
> Trevor  G0KTN
>
>
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