Thanks Carl,
Entering Jackson Brothers into Google brings up their catalogue, and
the first item under "Drives" is the very mechanism I was attempting to
describe in my response to Roger. Roger should now have no problem in
finding a "Jackson" source in the USA. 73, John. G3JVC.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Carl
Sent: 03 October 2009 14:37
To: John E. Cleeve; 'Roger'
Cc: amps@contesting.com
Subject: Re: [Amps] Vernier knobs?
I believe that Jackson Brothers or their new entity still produce those in
the UK and are sold in the USA.
Carl
KM1H
----- Original Message -----
From: "John E. Cleeve" <g3jvc@jcleeve.idps.co.uk>
To: "'Roger'" <sub1@rogerhalstead.com>
Cc: <amps@contesting.com>
Sent: Saturday, October 03, 2009 5:10 AM
Subject: Re: [Amps] Vernier knobs?
>I think that Roger is referring to a device known in the UK as an
> "epicyclic" drive, or shaft coupler, which consisted of a quarter inch
> diameter knob shaft, with a flat reduction mechanism, about one inch in
> diameter and a quarter of an in thick, which then had a quarter inch
> female
> shaft socket on the opposite side of the mechanism to couple with the
> device
> being rotated. From memory I think that the ratio was about 10:1. The
> graduated scale fitted on the outer of the reduction mechanism.
>
> These devices were very cheap and often formed the drive for many of the
> old
> BC radios, with the addition of the cord and cord drum which moved the
> dial
> pointers. 73, John. G3JVC.
>
>
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Roger
> Sent: 03 October 2009 01:12
> Cc: amps@contesting.com
> Subject: [Amps] Vernier knobs?
>
> I've been looking for some vernier knobs for quite a while. They'd be
> akin to a turns counter, but without the handle or counter. Appearance
> would be a knob with calibrations and a skirt with calibrations that
> moves a given travel for each turn. That's about the best I can
> describe one and It seems like I saw such an animal on some commercial
> test gear, years ago. No, I don't want the little turns counters that go
> with 10 turn pots. I just don't like the looks of them.
>
> IOW I could do this with turns counters, but I want to replace the turns
> counters with a much sleeker looking arrangement. These will be driving
> vacuum caps and a roller inductor.
>
> Any one ever see any of these critters, or know where I can find
> some.What I remember is something that looked similar to the knobs and
> skirts on my Alpha 76, but the skirts turned much slower than the actual
> knob. However what I want turns the shaft at the same speed as the knob
> while the skirt keeps track of the revolutions. Or is it just my old
> imagination playing tricks telling me that such exist...or used to.
>
> 73
>
> Roger (K8RI)
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