Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Pickup wiring short

12/22/2005 3:51 PM
Pickup wiring short
Got a new PRS guitar. Got it from an online store. I think they would be willing to work something out....but I think it will be easier to fix it around town. After a week of playing I noticed it has an intermittent short in the pickup wiring i guess. Here is what happens:  
1. I first noticed when I had the knob pulled up(in single coil mode) switching to the the treble pickup the volume would be cut in half. Again this is very intermittent. Some times it takes hours for this to happen.  
2. Then the thing I noticed was that when I did switch to the treble pickup(single coil mode) and it worked ok...after playing for a while the volume would dramatically cut out.  
So the only time there is a "short" is when its in single coil mode...and when switching to the treble pickup only.  
slight rant in this paragraph.... :) You can skip  
Ok I want to take it to a tech....but I have had bad experiences with tech's and "intermittent problems". I am 1 for 6 in this area...of getting an amp fixed and that 1 time was because I talked to the tech first and he agreed we would work on it over time. But, the tech's I talked to now....will not really agree to this. Soo.....  
I want to narrow down the problem further before I take it in. Can anybody help me pin point this problem from the description I gave you? Also, like in my old physics class...."Assume all other variables constant" the amp....cables...etc.  
Also, another option...the drummer in my band was trained in the military to solder stuff as some kind of engineering he could even look at the schematics and fix it if we point him in the right direction  
Here is a picture of the schematics.  
12/22/2005 6:48 PM

OOOOOOhhhhhh..drummers fixing guitars....that's scary!!! LOL  
First thing to look for is cold solder joints or broken ones. Your best bet is go over all your solder joints and redo/reflux them so you can get that out of the way.  
Next suspect would be the swith itself. That would be harder to troubleshoot, but from what you say I'd change it and be done with it.  
Hope this helps you.
Book Of The Day The Ultimate Tone, Volume III by Kevin O'Connor
Have you ever wondered if there is a better way to build a Bassman, Champ, Plexi, an 800, AC-30, Bulldog or Portaflex? Or you wanted to build an SVT with off-the-shelf parts? How about a master-volume amp that doesn’t change tone with the master setting? Everything you need to know is right here, including: proper grounding techniques, wiring methods, and mechanical considerations. Eighteen chapters cover the “iconic” amps everyone knows and loves, with schematics and layouts for each, along with the technical history of the product. Eyelet-board and chassis-mounted tube socket construction is used throughout, for easy servicing and modding. TUT3 is very accessible even if you cannot fully read a schematic and is a "must have" if you are going to build an amp for your self.

Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
12/22/2005 8:49 PM
Steve A.

Luigo said:  
Next suspect would be the switch itself. That would be harder to troubleshoot, but from what you say I'd change it and be done with it.  
    That's my guess, too. So does PRS use a special push-pull pot like Gibson (with a long bushing) or just a regular one?  
Steve Ahola  
P.S. Actually one way to test the push-pull switch on the pot would be to remove it from the circuit and see if the problems continue.
   Page 1 of 1