[ARC5] Tuning Knob

[MICHAEL BITTNER]

Yes, apparently combination of brass and aluminum is OK if properly stored in dry conditions or used away from moisture and hygrosocpic material such as dust.  The after-market copies of the mil. spec. spin knobs are cool, but as you say, not acceptable for military use.  Still wondering where they came from.  Mke, W6MAB (occasional lathe operating goober)

> On November 1, 2021 at 2:09 AM Mike Feher <n4fs at eozinc.com> wrote:
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>     Under normal circumstances there is no problem. Probably would not be approved for mil gear. For corrosion to set in an electrolyte needs to be introduced. It could be as simple as water. 73 – Mike
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>      
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>     Mike B. Feher, N4FS
> 
>     89 Arnold Blvd.
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>     Howell NJ 07731
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>     848-245-9115
> 
>      
> 
>     -----Original Message-----
>     From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of MICHAEL BITTNER
>     Sent: Monday, November 1, 2021 12:32 AM
>     To: Michael Hanz <aaf-radio-1 at aafradio.org>; Brian Clarke <brianclarke01 at optusnet.com.au>; Adam Castellani <adamcastellani at yahoo.com>; 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
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>      
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>     > On October 31, 2021 at 9:54 PM Michael Hanz <aaf-radio-1 at aafradio.org mailto:aaf-radio-1 at aafradio.org > wrote:
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>     >
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>     >
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>     > Agree.  Nicely made, but....
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>     >
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>     > On 10/31/2021 9:33 PM, Brian Clarke wrote:
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>     > > No chemist / physicist would put brass and aluminium together;
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>     > > hence, not a production item.
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>     > > So, probably after market, home made. Possibly a once-off.
> 
>     > > 73 de Brian, VK2GCE
> 



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