[Elecraft] K3 synth / PLL faulty

[Graham Kimbell]

My K3 (old synths, ser1198) has for a few weeks had an intermittent 
fault where the main rx synth loses lock. It seems ok when first 
switched on but once warm (after maybe 30-60mins) the rx can die.  It 
may seem ok but tuning around causes either complete failure or 
intermittent failure on certain frequencies.

Attempts at recalibrating the synth using VCO MD results in an error, 
typically ERR VCO 005.  If the fault is intermittent and I tap DISP to 
view PLL volts, and then tune around the volts will be ok and then drop 
to zero on frequencies where the synth dies.

I emailed elecraft support about this on 21 Jan but no response. I 
raised a query on the tech support page on 25 Jan, no response yet.  It 
looks like neither old synths nor new synths are available.

I'm about to pull the rig apart but has anyone any advice before I do 
that. Thanks in advance

Graham