[Boatanchors] Dark deposits on rotary switch wafers

[K5MYJ]

Whatever the crud was removing it made the receiver work for a while. It's 
not working now and It's too heavy for me to move right now. Maybe sometime 
this winter.

The crud was not conductive. It kept the HF LO from working.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "Glenn Little WB4UIV" <glennmaillist at bellsouth.net>
To: <boatanchors at mailman.qth.net>
Sent: Monday, August 13, 2018 1:40 PM
Subject: Re: [Boatanchors] Dark deposits on rotary switch wafers


> Your "Black Crud" is most probably silver oxide (as conductive as silver) 
> or silver sulfide.
> You should see the latter only if you live near a waste treatment plant or 
> other source of sulfides.
> Scraping it off, unless you have the skills of a plastic surgeon, will 
> also scrape off the silver leaving you with a very unreliable switch.
>
> 73
> Glenn
> WB4UIV
>
> On 8/13/2018 2:20 PM, K5MYJ wrote:
>> I have a SX-111 that had a problem with the band switch.
>>
>> I tried cleaning it with DeOxit several time without success.
>>
>> For some reason a black crud built up on the rotors. I finally had to 
>> scrape it off with an X-Acto knife.
>>
>> I have no idea what the crud was.
>>
>> Bob Macklin
>> K5MYJ
>> Seattle, Wa.
>> "Real Radios Glow In The Dark"
>> ----- Original Message ----- From: "Kenneth Grimm" <grimm at sbc.edu>
>> To: "Rob Atkinson" <ranchorobbo at gmail.com>
>> Cc: "Boat Anchors List" <boatanchors at mailman.qth.net>; "Grant Youngman" 
>> <ghyoungman at gmail.com>; "HL1FB" <yonglee at yonsei.ac.kr>
>> Sent: Monday, August 13, 2018 7:25 AM
>> Subject: Re: [Boatanchors] Dark deposits on rotary switch wafers
>>
>>
>>> "..But we're talking about radio hardware, not a tea service or
>>> the Stanly Cup..."
>>>
>>> I couldn't agree more!
>>>
>>> Deoxit D5 is all you need. Please avoid destroying a perfectly good 
>>> switch
>>> by using a Dremel tool. With a brute force treatment like that one 
>>> little
>>> slip and.....
>>> Deoxit won't make it shine, but WILL keep it working if all that is 
>>> wrong
>>> is a coating of silver oxide (which is a conductor anyway).
>>>
>>> 73,
>>> -- 
>>> Ken - K4XL
>>> BoatAnchor Manual Archive
>>> BAMA - http://bama.edebris.com
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>
> -- 
> -----------------------------------------------------------------------
> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
> QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
> "It is not the class of license that the Amateur holds but the class
> of the Amateur that holds the license"
>
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