VF1 VFO and HG 10 VFO voltages

[Kenneth G. Gordon]

On 21 Jun 2007 at 7:35, RAY FRIESS wrote:

> The HG 10 takes around 120 volts, plus filament.
> I know this because I looked once, wondering if I could power it with
> a small Ameco power supply that was used to run the Ameco six and two
> meter converters.

That is true. In fact, both VFOs will undoubtedly work quite well at 
voltages much lower than that. It doesn't take much voltage to get a 
properly constructed oscillator to oscillate.

However, the VR tube will no longer be regulating at input voltages 
below that which is required for reliable "firing": which is about 20% 
above the regulating voltage. I.e., 133 VDC for the 108 Volt VR tube in 
the HG-10, and 185 VDC for the 150 volt VR tube in the VF-1.

That's why I said ~150 VDC for the HG-10 and ~200 VDC for the VF-1 .

Ken Gordon W7EKB

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