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Guitar Tone Controls – PTB Control Mod on two Conductor Humbuckers – Out of Phase & Master Series

Guitar Tone Controls PTB Control Mod The best alternative

Guitar Tone Controls - PTB Control ModI made this guitar for a friend of mine. It is a Les Paul guitar type, but with a bolt on neck.

Since I had two BC Ritch humbuckers sporting two conductor wires only, I decided to use them as they are and to test all the possible mods you can do with such pups.

I could have modified them easily into four wire pickups, but doing that requires to wax them back again to avoid microphony issues. I could have wax them too, but since my friend is a drummer, he doesn’t need tons of fancy mods.

The only mods you can do with two conductor humbuckers are:
Out of Phase and master series.

The electronic have two push-pull potentiometers with an independent volume wiring. The two tone pots are the famous PTB Tone Control.

The neck pickup volume sets pickups out of phase, and the bridge volume is a master series.

The two bands EQ is very effective, especially on distortion sound.

2pp-phase-series

Out of Phase & Master Series

I adapted two different wiring schemes to create this setup. The out of phase and master series wiring is conventional. I used a plan from the famous deaf-eddie.netwebsite. This is the one published in this article.

I modified it to have the Out of Phase and master series options wired on the two volume potentiometers instead of the tone pots. I also inverted the hot wire from the pickups and the output wires going to the selector to have an independent wiring for the two volume pots.

The PTB Control scheme is from the website premierguitar.com. It was included in an article by Joe Gore.

This is a cool and quite affordable mod you can do on a guitar. If you plan to do that on a Les Paul guitar type, you only need to buy some capacitor. If you want to modify a Strat or any guitar owning 250K potentiometers, you’ll have to invest into two 500K pots.

If you buy the pots to do this wiring, make yourself a favor and buy one 500K and one 1meg potentiometer. The bass pot sounds even better with a 1Meg pot.

I had lots of potentiometers already and no 1Meg, so I did it with two 500K pots, and it works really well.

Diagram1c_WEB

PTB Tone Control

This PTB Control wiring is a modification of the two-band pattern that created by Leo Fender. It employs two tone potentiometers: One pot cuts the high frequency like a regular tone control, although the second filters out low frequencies. PTB stands for “passive treble/bass.”

This mod is a blessing for guitarists soliciting higher control over their distortion or crunch sounds, particularly with humbucker pickups. With the clean signal, the result is more subtle.

The downside of this wiring is that you are losing the independent tone pot setting for each pickup. The system being active on both pickups.

The PTB Control is the best alternative for tone control. I tried everything possible: Varitone with 6 or 12 positions and with an inductor or not, and the infamous passive mid boost.

The PTB is by far the most flexible and useful of them all. The mid boost sucks, and with a varitone, high value above 0.047uF are not usable on a guitar. Since most capacitors offer no difference when they are on ten, the only contrast you have with a varitone is in the low part of the capacitor. This is not very useful because you can get equivalent settings with the knob of a conventional tone pot.

gears needed:

  • Two 500k potentiometers ( or one 500K and one 1meg pot)
  • One 0.022uF capacitor
  • One 0.0015uF capacitor

that’s all

Check out the video

If you can’t retrieve the ones from your guitar here are some links to order tone pots and capacitors.

  • Potentiometers @  Aliexpress
  • Mylar Capacitor @ Aliexpress
  • Potentiometers @ Amazon
  • Mylar capacitors @ Amazon

I’d be more than happy if you could post a link to a review of your wiring in the event you intend to do this mod or if you have already made it.

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This post is also available in: French

2 Responses to Guitar Tone Controls – PTB Control Mod on two Conductor Humbuckers – Out of Phase & Master Series

  • I’ve got a hagstrom and am planning to replace the mut switch with a bass control as per this wiring. Question: why is the bass pot not grounded. And if I was to have the bass pot fed straight from the 3 way switch would I need to ground it?

    • The bass cut doesn’t go to ground at all. The low filtering cap is inline with your signal. Its output goes to the volume pot. You should follow the diagram.

      Another diagram you can use for 3 pots guitar or strat like wiring
      Another diagram you can use for 3 posts guitar or strat like wiring

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