The K3DSPUPGD is the Rev D upgrade for earlier K3’s, which I’ve had for a long 
time (well, actually a Rev C with the LPF board).

The upgrade I’m referring to is the the K3S DSP board (with updated audio amps 
for reduced IMD).  When the K3S was announced, the indication was that this 
newer board would be made available to K3 owners as an upgrade.


> On Sep 20, 2016, at 3:37 AM, Barry Simpson <> wrote:
> Hi Grant
> It is the K3DSPUPGD board. It is buried away but only on the Spare Parts and 
> Mod Kits page on the Elecraft website. I got one a few months ago when I 
> upgraded my K3 with all the other new boards as well.
> On 20 September 2016 at 10:19, GRANT YOUNGMAN < 
> <>> wrote:

> Anyone ever heard a fact or rumor (or conspiracy theory related to 
> chemtrails) about what happened to the early advertised DSP board upgrade for 
> the K3 that included the new low distortion AF amp in the K3S??
> It was announced as one of the upgrades that would be available for the K3.  
> Apparently still buried under the cone of silence … but it would be nice to 
> have some definitive answer from Elecraft one way or the other.
> Grant NQ5T
> K3 #2091, KX3 #8342

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