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FDP Forum / The 'Pup' Tent / Signal mysteries

scott-s
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juneau ak.

If you must smoke, please smoke salmon!
Jan 29th, 2015 03:36 PM   Edit   Profile   Print Topic   Search Topic


I've been fighting a loosing battle with the neck pup on a SG (Classic 57 pup's) ever since I changed out the pots. The problem had been intermittent for the longest time. Just a few days after changing stuff around and checking joints, pots, caps, switches, and wire the problem would come back again.(2 or 3 attempts) I checked the pup and it seemed O.K. then I cut off the last few inches of the braided wire I thought the
old solder and heat had degraded it, that didn't work either Then a friend told me to take the cover off and inspect the ends of the coil, well all I really did was un-solder the cover from the base and try to see the ends but without a 5X lens I couldn't see any obvious issues so I put every thing back together and it's been Jake ever since!(about 2 weeks now) I'm keeping my fingers crossed and hoping I somehow got lucky and finally fixed it.

BTW, I'm so very impressed with these P.U.'s I can get some very sweet clear tones out of a guitar that is probably thought of as just a heavy metal Ax. And ya, it is when I play it through a Peavey EVH 5150 or it's ilk, but add a Twin with reverb and it's a whole different story.

Peegoo
Contributing Member
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Gonna introduce you

to the Buena Buena
Jan 30th, 2015 10:49 AM   Edit   Profile   Print Topic   Search Topic

If the problem started when you swapped out the pots, it is VERY probable the issue is not somewhere under the pickup cover. Always approach a circuit problem from the "what's different" perspective.

Steve Dallman
Contributing Member
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Merrill, Wisconsin

Age is just a number...mine is big
Feb 6th, 2015 05:29 PM   Edit   Profile   Print Topic   Search Topic

A meter would help troublshoot. Even an $8 digital meter from Harbor Freight would work fine. Then you could measure the pickup, and wiggle the wiring to see if it fouls up.

Peegoo is right. When you hear hoofbeats, think horses, not zebras. What you changed is what you suspect.

Peegoo
Contributing Member
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Slep in da graveyard

it was cool and still
Feb 8th, 2015 04:29 PM   Edit   Profile   Print Topic   Search Topic

If the pickups have a metal braid shield, make dang sure the pickup leads are laying next to the pots and not crossing over them or running anywhere near the pots' solder tabs.

If the metal braid contacts any terminal that carries signal, the signal will be shorted to ground and you'll have no sound from the pickup.

amphead4
Contributing Member
*******

Cincinnati, USA

Feb 13th, 2015 08:39 AM   Edit   Profile   Print Topic   Search Topic

Just put a pot with DPDT push-pull switch in a guitar for pickup phase. Didn't work right until I cleaned the contacts with Deoxit.

Switch was NOS from my parts drawer.

scott-s

juneau ak.

If you must smoke, please smoke salmon!
Feb 13th, 2015 10:47 PM   Edit   Profile   Print Topic   Search Topic

Well so far so good. I just used that guitar at open mic last night and played it for an hour or so earlier in the day to make sure there would be no glitches. I know what you guys are saying about going back through what was changed, I did, twice, and took it to a pretty sharp guitar wizard and even he was stumped. He's the one that told me to take the covers off and peek inside. Somewhere I changed some thing that chased the gremlins away!

Peegoo the braided shield wires coming off the pup's are in fact soldered to to Vol. pots case but that's how its set up any-hoo from Team Gibson!

Peegoo
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Can do wheelies

on a unicycle
Feb 19th, 2015 06:53 PM   Edit   Profile   Print Topic   Search Topic

They're supposed to be that way.

My point is that the 'extra' length of braided pickup leads needs to be secured away from the pots. If any of the braided lead touches ungrounded solder terminals on either the vol or tone pots, it will kill the signal.

I mention this because I've run into it as a cause of the symptoms you describe.

FDP Forum / The 'Pup' Tent / Signal mysteries




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