[Heathkit] VF-1 minor annoyance...

Fri, 14 Jun 2002 16:10:03 -0400

  My guess would be dirty contacts on the bandswitch.

Mark  WB8JKR

On Fri, 14 Jun 2002 11:01:04 -0700 "Kenneth G. Gordon" <[email protected]>
writes:
> 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
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