[Elecraft] PLL temperature compensation What S/Ns?

[k6se@juno.com]

Gregg, W6IZT wrote:

"What S/Ns is this mod applicable too?"
==========
The PLL drift mod and the BFO drift mod, as well as all previous
Elecraft-approved mods that make the K2 a better performer are no longer
modifications but are built into all new K2s beginning with #3000, as I
recall.

The PLL drift mod had an astonishing improvement in my K2 (#2622). 
Before the mod it drifted about 170 Hz just on a 30-minute warmup.  After
the mod it drifts only a few Hz from 70F to 140F.

The BFO drift mod (simply replacing an inductor with a prewound toroid)
totally eliminated a major problem I had because the BFO drift caused my
CW filters to no longer be centered (as set up by Spectrogram) at my
sidetone pitch when the rig's temperature changed.

73, de Earl, K6SE
K2/100 #2622