Dimensions:
B124 Tone Control
1.260
.510
.400
CCW W CW
1
2
3
4
TONE
B124rH
SOLDERING:
If you don’t have connector cables, or prefer to solder to the control,
solder pads are provided. The diagram to the right shows the pads for
soldering.
.965
.650
SOLID SHAFT
SPLIT SHAFT
General Operation
The B124 Passive Tone control is included with original EMG Pickups and Pickup Systems. There are two versions, 25K Ohm for Active EMG’s
and 500K Ohm for EMG-HZ Passive Pickups. The 25K Ohm control has a black PC Board, the 500K has a green PC Board, both are Audio Taper.
The wiring configuration is the same for both 25K and 500K Controls. The tone capacitor is small and is mounted on the pot side of the PC Board.
There are 4 header pins, (2 pairs of signal and ground) the two pairs are identical so either can be used for tone control with the second pair
for in/out. Examples are shown in the included diagrams. The B124 features plug-in compatibility with all EMG Pickup Systems by using .100
(2.54mm) standard pin spacing. You can solder to the control by using the 2 solder pads on the PC Board if connectors are not available, 1 of
the solder pads is for input and the other pad is for ground, see below.
0230-0162B
INSTALLATION INFORMATION
EMG MODEL:
B124 TONE CONTROL
(ACTIVE PICKUP INPUT 25K OHM, BLACK PC BOARD)
(PASSIVE PICKUP INPUT 500K OHM, GREEN PC BOARD)
© 2009 Copyright EMG INC. All Rights Reserved.
PO BOX 4394
SANTA ROSA, CA
95402 USA
P (707) 525-9941
F (707) 575-7046
EMGPICKUPS.COM
Schematic Diagram:
B124 Tone Control
GROUND
The EMG coax cables for wiring the guitar are a 2-pin pair,
The signal or “Hot” wire is White, the Ground (Shield) wire is Black.
8mm Dia.
P.75
C1
104
A25K
CCW
W
CW
1
2
3
4
IN/OUT
GND
IN/OUT
GND
*HZ VALUES
A500K*
473*
CW (CLOCKWISE)
INPUT
SCHEMATIC NOTES:
The Schematic diagram above shows how the B124 Tone control is configured.
Pins 1 and 2 are the input to the CW (Clockwise) terminal of the control.
Pins 3 and 4 are a duplicate of the CW (Clockwise) terminal of the control.
Pins 2 and 4 go directly to ground.
