Handwired in the USA
- Wired 50's style for authentic vintage sound and feel.
This is a prewired harness for USA Gibson SG's. Carefully wired “50’s Style” and grounded with vintage spec buss wire for a great vintage tone. For import guitars you may need to enlarge the holes for the higher quality US spec electronics to fit and also you may need US Spec knobs (to accept 24 teeth split shafts).
Includes:
- (4) x 550K Emerson PREMIER PRO Split Shaft Potentiometers
- (1) Switchcraft J11 1/4" mono input jack (3/8" length Bushing) (MADE IN USA)
- (1) Centralab Right Angle 3-Way Toggle Switch (Deep Threaded Nut Included) [DOES NOT INCLUDE SWITCH TIP]
- (2) Emerson Bumblebee Paper in Oil Capacitors (1: 0.022uf Bridge, & 1: 0.015uf Neck)
- (1) Wiring Diagram
Switch Tip NOT INCLUDED
What’s so special about ’50s style wiring?
- The overall tone gets stronger, tighter, and more transparent. It’s difficult to describe, but you might say it’s more “in your face.”
- The typical treble loss that occurs when rolling back the volume is much less than with standard wiring. Both the volume and tone controls become more responsive, and they react more smoothly without the usual hot spots. Another bonus: By simply rolling back your guitar volume a bit, you can clean up an overdriven amp without getting lost in the mix.
- The tone and the volume controls interact with each other—something you might be familiar with from certain tweed-era Fender tube amps. When you change the volume, the tone changes a little bit as well, and vice-versa. This may be strange at first, but you only need a few minutes to get used to it.
Installation Tips for Knobs on Split Shaft Pots
US Spec split shaft pots are made to fit USA Spec 24 spline push-on knobs. Some USA & Import Guitars will need new USA Spec Knobs as even some US makers use import spec parts which will not work with our pots. We recommend that you don't rush the knob install process. If your knob is too tight and is not going on ,slightly crimp together the top of the potentiometers shaft ever so slightly so that when you go to push on the knob you don't damage the pot shaft by exerting too much downward pressure. If you have any questions regarding install please let us know.
In late 2025, Slash started using our 500K pots on tour—and loved them.
But for some of his darker guitars, he wanted just a bit more clarity and openness… without losing the weight or character of the instrument.
That’s where the idea for 550K came from.
Why 550K?
- 500K → warm, balanced, familiar
- 1 Meg → brighter, more HiFi, sometimes too thin
550K sits right in between.
It can add:
- More clarity and air
- Better note definition
- Without sacrificing low-end punch or midrange feel
Not a drastic change—just the right amount.
What You’ll Notice
- Your tone stays alive when rolling back volume
- Chords feel less congested under gain
- High end is clear, not harsh
500K = classic
550K = classic, opened up
Measured, Not Assumed
We don’t rely on printed values—we test and sort every pot.
500K Kits
- Volume: typically 500K–510K (up to ~525K)
- Tone: typically 470K–495K
550K Kits
- Volume: typically 550K–565K (up to ~580K)
- Tone: typically 530K–549K
One Quality Level
This isn’t “better vs best.”
At Emerson, everything we make is:
Top tier. Second to none.
The same components and care that go into Slash’s gear go into yours.
You’re not choosing quality—you’re choosing tonal preference.
If your guitar already sounds great—but you want a little more:
- More clarity
- More definition
- More usable top end
550K gets you there—without changing what you love.
More openness. Same Emerson soul.
