View Full Version : Installed bass roll-off control in Les Paul - very neat!
01-28-2011, 08:09 AM
I replaced the neck tone control in my LP with a passive bass roll-off. When you turn in down, instead of rolling off high end, you roll of bass. Very similar to Reverend's Bass Contour control. It's great for tightening up the neck pickup if your tone is a little too woofy. Here's the simple wiring diagram:
01-28-2011, 09:32 AM
01-28-2011, 09:36 AM
Gibson's old L6S model had a passive mids roll off that I found pretty useful, but that uses a 1.8Hy inductor as well as a capacitor. Interestingly enough, it also uses a capacitor in series to limit the response of the neck pickup in its "both pickups in parallel, out of phase" pickup selection. Worthy of note, however, is that the cap phase-delays the signal. Since that selection is working with the two pickups out of phase, it mellows things out, but if your setup is phase-delaying the signal from the neck pickup, you might also find that it affects the sound when you select both pickups.
And I have a couple of Carvins that have an active-passive module; in active mode there's both a master treble and a master bass that will dial in a 15 dB boost or cut. The "5" position on both knobs gives you approximately what you'd get with a standard tone control at 10.
There's a guy in Denton, TX that knows a lot about electronics/does excellent work and we discussed a mod similar to this for either my hollow body or my LP (I can't remember which). When he described it and showed me an example, it made absolute sense.
01-28-2011, 09:58 AM
Pretty cool. I also like the treble bleed cap or cap/resistor mods you can put on the guitars volume(s).
01-28-2011, 10:17 AM
There's a guy in Denton, TX that knows a lot about electronics and we discussed a mod similar to this for either my hollow body or my LP (I can't remember which). When he described it and showed me an example, it made absolute sense.
This has been available for a LONG time, of course (since before the LP came into existence). You can also get passive sweepable cuts, where the amount of cut is fixed but the frequency varies, as opposed to the above, where the frequency is fixed and the amount of cut varies. And there are *active* sweepable boosts, where the amount of boost is fixed but the frequency can vary (see the Chandler Tone-X).
Gibson's notch filter concept (used in Varitones) will give you some of the same kinds of results.
01-28-2011, 10:47 AM
Back in the '80s, Art Valdez installed an inductor from an ES335 stereo so that I could roll bass on the neck PU and roll treble (with conventional tone control) on the bridge PU. I miss it.
Yours is a really elegant solution.
I just installed a concentric pot on my McCarty Braz to implement a dual spin-a-split control. That works great as well.
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