i bought mine from Allied Radio in about 1962 to gain some fine tuning on my
Space Spanner regerentative control. If you remember all of that, YOU ARE OLD.
Of course, what you want was a common item back when parts were needed by
people and not by huge assembly companies (that only want one set of things).
I remember multiple versions and sizes.
I am keeping mine. 73,
Charles Harpole k4vud@hotmail.com
> From: ToddRoberts2001@aol.com
> Date: Sat, 3 Oct 2009 14:27:22 -0400
> To: amps@contesting.com
> Subject: Re: [Amps] Vernier knobs?
>
> It sounds like for what you are looking for you will have to make
> something up from parts. A vernier knob turns counter with a center
> knob marked with perhaps a degree wheel to count the increments
> of each turn and a larger separate outer circumference dial that turns more
> slowly to count the individual turns 1-2-3 etc.
>
> If such a turns counter was availiable these days I'm sure the seller would
> want a ridiculous price for one IE Surplus Sales of Nebraska.
>
> There is a place that has 6:1 vernier drives for a 1/4" shaft input
> on each end, newly made in the USA and in stock for $11.50 each.
>
> 1N34A.com
>
> Go to their PARTS section and look up vernier drives. I know some
> people gang two of these together for a 36:1 reduction which
> would be close to what you are looking for. Then you would have to
> figure out some way to couple the second shaft drive back up front
> to turn the outer circumference dial marked 1-2-3-4 turns up to 36 turns.
> Plus you would need to couple off the front center knob for the actual
> drive to the roller inductor and vacuum caps. Perhaps a small toothed
> belt drive off the front shaft would work here. I bet the coupling could
> be done
> with a little ingenuity.
>
> 73 Todd WD4NGG
>
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