Well, Im not going to search the full catalog for you Roger but when I sold
JB drives it was called the model 5857 10:1 Epicylic Drive.But I dont think
that is what you want.
Now, the dual speed drive is the 4511/DRF with a 36:1 and 6:1 ratio. Youve
forced me to wander down to the caverns and I see that I still have a few
NOS left. Plus a few other JB drives.
The 4511/DAF 6:1 drive is what is used on many commercial ham amps unless
they use the easy to fail MFJ/OEP copy.
Carl
KM1H
----- Original Message -----
From: "Roger" <sub1@rogerhalstead.com>
To: "John E. Cleeve" <g3jvc@jcleeve.idps.co.uk>
Cc: "'Carl'" <km1h@jeremy.mv.com>; <amps@contesting.com>
Sent: Saturday, October 03, 2009 1:36 PM
Subject: Re: [Amps] Vernier knobs?
> Thanks for trying.
>
> It wasn't quite that straight forward...Entering "Jackson Brothers" into
> Google brought up many, many pages for entertainers, food companies, and
> many others. "Jackson Brothers catalog" did bring up
> http://www.mainlinegroup.co.uk/jacksonbrothers/index.htm with item 4511
> being a ball drive, but unfortunately this appears to be a drive reduction
> unit. What I need is a straight through drive that has about a 10:1 or
> even 30:1 reduction for the indicator, or knob flange. IOW the input and
> output shafts make 30 turn while the flange makes one.
>
> The Aluminum dial drive ( 4090) or (4489C) looks like it might be what I'm
> after, but I can't tell if it's a drive reduction, or a dial reduction
> with a straight through shaft.
> Basically what I need is the equivalent of a turns counter without the
> crank and window although a spinner might be nice on the knob.
>
> 73
>
> Roger (K8RI)
>
> John E. Cleeve wrote:
>> 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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