[ARC5] Tuning Knob

[Michael Hanz]

That sounds right, Robert.  Never saw a reference mark on the 1939-1945 
ARC 6743, but there was also a later postwar version around here 
somewhere made for postwar ARC receivers that had engraving and maybe 
even a small interpolation scale? of some sort for the ~1/4" thick disk 
that is somewhat larger in outer diameter than the 6743 disk.  My memory 
is fuzzy on it.  I have photos of all the wartime ARC 6743 piece parts 
in the last segment down the page at 
https://aafradio.org/garajmahal/flex_drive_cables.html - I guess I need 
to find the later one and add it to the photos just for completeness.

- Mike

On 11/1/2021 2:04 AM, Robert Downs via ARC5 wrote:
> The fact remains that for whatever reason, the similar production crank (that I have one of somewhere) uses a steel or SS rivet in the center, not brass.  And has an engraved and black-filled reference mark opposite the crank throw.  So the one photographed wasn't made on an Army, Navy or Air Force contract.
>
> Robert Downs
>
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of MICHAEL BITTNER
> Sent: Sunday, October 31, 2021 23:32
> To: Michael Hanz; Brian Clarke; Adam Castellani; arc5 at mailman.qth.net
> Subject: Re: [ARC5] Tuning Knob
>
> I picked up this Cardwell var cap at the TRW swap meet yesterday.  Note all the Brass-on-Aluminum faying surfaces.  No signs of corrosion on this decades old component.  So how does Cardwell get away with what "no chemist or physicist would do"?  Mike, W6MAB
>
>> On October 31, 2021 at 9:54 PM Michael Hanz <aaf-radio-1 at aafradio.org> wrote:
>>
>> Agree.  Nicely made, but....
>>
>> On 10/31/2021 9:33 PM, Brian Clarke wrote:
>>> No chemist / physicist would put brass and aluminium together;
>>> hence, not a production item.
>>> So, probably after market, home made. Possibly a once-off.
>>> 73 de Brian, VK2GCE