VF1 VFO stability improvement.

[Kenneth G. Gordon]

On 21 Jun 2007 at 13:19, Glen Zook wrote:

> However, replacing the 0A2 in the VF-1 with an 0B2
> which drops the screen voltage on the oscillator tube
> to 108 volts helps stabilize the VF-1 considerably.

Very true.
 
> Then running a regulated 150 VDC as the high voltage
> helps even more with the stability.

I have not yet found this to be necessary, but will probably try it in 
future.

> 
> Finally, replacing the 6AU6 with a 6AH6 (direct
> replacement) really stabilizes the VF-1.

I can attest to the validity Glenn's suggestions:although my present 
VF-1, which I use with my HW-16, was very stable before I made 
two of the "mods" suggested by Glenn, after I did them, one of the 
fellows I normally work with handling traffic on CW nets 
commented to me that my rig sounded like a new rice-box for 
stability. 

I was not sure that I liked that, but I did take it as a compliment as I 
am sure that is what he meant.

In any case, my VF-1s are very stable, and warm-up drift is 
minimal.

Ken Gordon W7EKB

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