[Elecraft] Strange K2 Failure Mode

[Jim Brown]

I bought a k2/100 from someone on this list several months ago, and 
shipped to my remote QTH in CA. Just got out here to play with it 
last weekend. It works fine on 160, but on 40 (and probably other 
bands, haven't had time to check) the tuning knob tunes makes the 
frequency readout change but the transmitted frequency (as observed 
on another radio) doesn't.  The readout said 7002 kHz, but the 
transmitted (and receive) freq was around 7070. 

Any ideas what could be causing this?  Some operational settings I'm 
forgetting about? 

Other "glitches:"  

Tuning knob is VERY stiff compared to my own K2. Don't have tools 
with me to work on it here to diagnose cause. 

Strong transients when the RF gain knob is turned (sounds like DC on 
the pot from a leaky cap).  Causes the AGC line to essentially mute 
the radio for a second or so, then recovers to where the knob sets 
it. 

Any ideas on these things?  

Jim K9YC