[Boatanchors] Johnson Ranger II VFO drift

[J.D. Mac Aulay, WQ8U]

I received the following request for assistance from
Goetz, DJ3IT.  If anyone on the list has experience
with this drift problem in the Ranger, your insights
would be appreciated.
Thanks & 73
Mac
WQ8U

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I recently acquired an EFJ Ranger II that was built 
from kit by
its previous owner in the early sixties. Although the 
tx is in
working order it is lacking VFO stability. The drift 
on 80m seems
acceptable to me but not so when the 40m coil (40 - 
10m) is in use.
I tried several times to adjust the temperature 
compensation as
explained in the manual but to no avail.
That's what it does when observed on 15m: For the 
first 1h45min the
VFO drifts down approx. 4 kHz (on 15m). Then for a 
period of 30 to
40 minutes drift slows down and reverses. In this time

slot drift
on 15m was about 30Hz per 10 minutes. After a total of

2h30min the
VFO drifts up at about the same speed as initially. 
i.e. another
4 kHz in slightly less than 2 hours.
Can you give me some advice what to do about this 
drifting, please?

73 de Goetz
dj3iw at t-online.de