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

[sr2000 k9axn]

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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