[Elecraft] K2 BFO drift problem

[Don Wilhelm]

That indicates that you should concentrate on L33 and things around it.  
"Nudging" things and finding significant changes indicates a bad 
connection somewhere and/or possible shorted turns.

Did you flush cut the leads on the RF board under it?
Is it mounted on the rubber bumper?
Did you cut half of the tip on the bumper off?
The resistor is effectively an insulator, and also provides mounting 
stability.
After soldering the leads to the board (and to the L33 wires), you 
should push the resistor body down into the center of the toroid to 
secure L33 tightly.

Resolder the resistor leads and the leads of L33 again to see if that 
helps,  If not, request a replacement L33 and the resistor to mount it.  
It does sound like there is something amiss with L33 - or the soldering 
of the crystals under it.  Before mounting a new L33, re-flow the 
soldering below it.

73,
Don W3FPR

On 4/13/2014 2:45 PM, TheMG . wrote:
> Well, I messed around with it a bit more and I gave L33 and very light
> nudge with the plastic tuning tool while looking at CAL FCTR. This
> caused the BFO frequency to suddenly jump down from 4913.30 to
> 4912.42.
>
> Strange thing is, only a few minutes after nudging L33, the BFO
> frequency had already drifted 100Hz up and still drifting. I give it
> another nudge and it drops down again but then eventually resumes
> drifting upward.
>
>