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FDP Forum / Guitar Mods, Repairs, and Projects / Just When I Thought...

Te 52

Laws of Physics

strictly enforced
Apr 10th, 2019 09:22 PM   Edit   Profile  

...I had soldering to the back of pots completely in the bag: sand back with 320 grit, tin wire if necessary, broad chisel tip in iron, temp maxed at 850 degrees, liquid flux on joint, tin tip, boil off flux, apply solder, done...I came across one that completely threw me.

I'm putting new electronics in a 62-year-old Gretsch and duplicating the original circuit. Guitar uses a dual 500K/500K pot as a tone control. Found a suitable Alpha part at Amplified Parts, set it up to solder, and absolutely could NOT get solder to stick to the back of the pot.

After about the third failed attempt, it suddenly dawned on me...instead of the back of the pot being part of a stamped steel can, this one has a flat crimped-on back. You don't suppose...reached for a magnet, and sure enough, the back of the pot is a separate *aluminum* plate.

Once I realized that, I just soldered my grounds to the *sides* of the pot, which are still steel.

In the hopes that this will save somebody, somewhere, sometime, some grief and frustration, I present this as a Public Service Announcement.

The Suspect

Contributing Member

Just beyond Mars

there's a world of fools
Apr 10th, 2019 10:50 PM   Edit   Profile  

Ah yes! Some stacked pots are made weird like that. You could solder to one of the tabs if you had to.

I had a similar thing with solder not sticking, so I put a new pot in. Turned out the owner had 'cleaned' the pot with aerosol silicone lube.

FDP Forum / Guitar Mods, Repairs, and Projects / Just When I Thought...

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