[Hallicrafters] Cleaning Band Switch (SX-42/62)

[Richard Knoppow]

    Micalex, Micamold was a brand of capacitor.  I've found that small 
artists brushes work well for both Deoxit and oil. If you mean 
photographic retouching brushes they are the same thing. I don't like 
cotton swabs because they tend to leave cotton fibers behind.
    I started using a light coating of Vaseline or silicone grease after 
the Deoxit treatment. It keeps the surfaces from oxidizing again quickly.

On 11/23/2016 5:45 PM, sr2000 k9axn wrote:
> Waldo, Jim,
>
> The band switches can be made with two kinds of phenolic; paper and
> phenolic and mica and phenolic (Micamold).  The paper version is a bit
> darker and mica lighter.  If you clean the paper version with alcohol
> even Everclear, the alcohol will absorb any water vapor in the air and
> will be absorbed by the wafer.  The Mica will be fine with alcohol, it's
> not absorbed.
>
> The later wafers are made with Micamold; I don't know when Hal changed
> but I do know that most of the SR series radios have it
>
> If your careful Deoxit Fader lub will last indefinitely on band
> switches. You don't want to spray it on because it has a lubricant.
>
> Rather than Q tips use what are called touch up brushes.  The fiber tip
> comes in a number of sizes some no wider than a scratch --- they will
> leave no fiber in the switch.
>
> Note:  If a switch fails repeatedly it probably has lost any wiping
> action. Reform the tab just a bit and it will be fine.  The rotor has to
> ride up the tab incline to keep it clean.
>
> Kindest regards Jim K9AXN
>
>
> -----Original Message----- From: w5jo at brightok.net
> Sent: Wednesday, November 23, 2016 6:20 PM
> To: Waldo Magnuson ; hallicrafters at mailman.qth.net
> Subject: Re: [Hallicrafters] Cleaning Band Switch (SX-42/62)
>
> I gave up on Deoxit a long time ago Skip.  It lasts only so long and, when
> gone, the problems return.
>
> Depending on the wear of the contacts, I have better luck with Denatured
> Alcohol.  Not only does it clean, it drives out the moisture that may have
> accumulated in any wafers.  It takes more work and time but lasts much,
> much
> longer.
>
> If the contacts are worn badly, good luck.
>
> 73,
>
> Jim
> W5JO
>
> -----Original Message-----
>
> Hi, I have been using Deoxit on a long q-tip to try to clean the
> contacts on
> the Band Switch. Only so-so effective. Any suggestions? How are others
> cleaning contacts? Thanks.
> Skip Magnuson W7WGM
> Spokane, WA
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL