Wiring Using The G&L PTB Tone Control Setup

Snouter

New member
I dropped in a Seymour Duncan SH-2 (Jazz) and a TB-4 (JB) into my old Swamp Ash G&L S-500 and it ended up sounding great as far as tone using Leo Fender's independent treble and bass control setup.

The assumption going forward is that the pots' posts are pointing downward. I will add a pic next time the S-500 is apart.

My recent Warmoth project is only one pickup and a 250 volume pot with a little brown ceramic capacitor that says 203 soldered to the post that the pickup + is soldered to (the far left post) and the middle post that the + output is connected to. The far right post goes to ground and the - output is soldered to it. Not really sure about that capacitor. I only did that because G&L apparently did that back when they produced the Rampage which was just one pickup and one volume pot.

I am thinking of adding the G&L PTB tone setup because it adds so much more flexibility in tone. On my S-500 it goes something like this. I will note what is happening on each pot so there will be some redundency.

Volume pot=250K Left post received wire from left post of bass pot. A brown ceramic 201k capacitor is soldered from the left post to the middle post. Middle post received wire from positive (+) post of output jack. Pickup ground wires, ground wire from treble pot case and right post itself are grounded to the pot's case.

Treble pot = 500K Left post is empty. Middle post has a green polyestor capacitor that says 223J100V going to ground on the pot's case. Pickup power wires and a wire from the middle post of the bass pot are soldered to the right post. Ground wire from volume and bass pot cases are grounded to the pot case. Ground wire on case goes to bridge ground.

Bass pot = 1,000K Left post recieves wire from left post of volume pot. Left post has a green polyestor capacitor that says .0022K100UA going to the middle post. Middle post has a wire going to the right post of the treble pot. Middle post a green polyestor capacitor that says 2A102K grounded to the pot's case. Ground wire on case goes to treble pot's case. Case receives wire from ground (-) wire post of output jack. Right post is empty.

Anyone have any ideas as to the numbers on the capacitors? Why are the green square style used? Where can you find them?
 
Re: Wiring Using The G&L PTB Tone Control Setup

The numbers on the caps are the capacitance value of the cap. It really doesn't matter if you use green caps.

The cap on the volume control is what is sometimes called a "treble bleed" or "bright" cap - it helps reduce the loss of highs when the volume control is set to something lower than "10". The 201K means a 200 pico farad value. The K is a tolerance.

The treble pot cap of 223J100V is a .022 micro farad value. The J is a tolerance. 100V is a rating of 100 volts.

The bass pot. .0022K100UA - hmm, got me. But since a good value for this cap would be a .0022 microfarad, that looks close. K would be a tolerance, but I don't understand the 100UA part, but would guess it is also a 100 volt rating.

The 2A102K looks like it would be a .001 microfarad value - but if I were you I would leave this one out completely. As it is wired according to your description, it would be a permanent treble cut.
 
Re: Wiring Using The G&L PTB Tone Control Setup

Thanks for the great info! The treble cut on that dedicated bass pot seems to make sense though doesn't it?

I just took a pic of the original G&L S-500 pickguard flipped over but the shiny stuff on there made it difficult. There is a "expander" switch on there I did not mention. It just activates the bridge and neck together in the 1 and 5 position. I left a lot of the pickup wires there so more wire would be available in case I needed to resolder with fresh pickup wire.

PTB.txt


I was searching the net and the orange drop capacitors look cooller than the green. They seem to have a variety at Mouser Electronics.

Edit 2/23/07: I figure I will use this setup in at least two guitars so I went ahead and ordered 6 Orange Drops (I hope that is what they are) from Mouser since they were the only place I could find that had the .001, .0022, .022 all at 100V. Less than $4 total for parts.
 
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