[Heathkit] VF-1 minor annoyance...

[Kenneth G. Gordon]

I have an excellent VF-1 (the later model with the steel chassis, ceramic 
sockets, and ceramic bandswitch), which has an annoying characteristic 
in which it jumps frequency a few cycles on a random basis. I have 
replaced both the VR tube and the oscillator tube several times and it still 
occurs. Over the years, I have replaced nearly every resistor and cap 
(except the tuning cap) in it with modern ones as they drifted out of spec. 
Calibration is about as good as I have seen, and there is no drift or chirp 
on any of the bands I use ( I don't use it on 10...yet). I have checked all 
components for looseness, including the slugs, and nothing is loose 
anymore. 

Yet I still get the jump whether I am using the 160 meter or 40 meter 
output.

Anyone have a similar experience? If so, what did you do to fix it?

The VF-1 I used with my modified DX-35 ("economy"power supply 
with a heavy enough power transformer, SS rectifiers, decent meter, and 
got rid of that idiot series osc/buffer across the HV idea), to drive a BC-
610 for RTTY in the 1960s never did this...

Ken Gordon W7EKB