TONE
B124rH
PASSIVE
TONE
1
2
3
4
TONE
B124rH
4
3
2
1
B124 Page 2
NECK
VOLUME
BRIDGE
VOLUME
NECK PICKUP
BRIDGE PICKUP
Independent Volume with 2 pickups and a selection switch:
Diagram #3 shows a very typical tone control wiring for a Les Paul style guiar, two pickups with a selection switch. As you can see, the tone controls
have a coax cable going to pins 1-2 (or 3-4). This illustrates that there is only an “input” needed to the tone control, and in this instance the signal is
not being “passed-thru”.
6
5
4
3
2
1
TO OUTPUT JACK
FROM PICKUP
Diagram #1
Tone control input on either pair 1-2 or 3-4
“Signal-thru” to output jack on either pair 1-2 or 3-4
VOLUME
Diagram NOTES:
Pairs 1-2 and 3-4 are interchangeable, both are the CW pair.
Passive tone controls like the B124 are wired parallel to the signal of the pickup, or at the output of the instrument. There is only an “input”, not an
output of a passive tone control. The B124 has two additional header pins (3-4) that could be called “signal-thru” or “pass-thru” so that if the
instrument is wired with a master tone control, the signal to the output jack can be gotten from the tone control. This is most useful if the instrument
is wired Volume/Volume/Master Tone and does not have a selection switch. The diagrams below will further explain.
Independent volume with 2 pickups and no selection switch:
Diagram #2 illustrates another example of the benefit of the second set of pins on the tone control, it shows a similar wiring arrangement as above
but in an instrument with two pickups and no selection switch. This is similar to a Fender Jazz Bass*.
6
5
4
3
2
1
TONE
PASSIVE
TONE
1
2
3
4
TO OUTPUT JACK
Diagram #2
NECK VOLUME
FROM NECK PICKUP
FROM BRIDGE PICKUP
BRIDGE VOLUME
BRIDGE TONE
COAX CABLES
TO B157 PICKUP BUSS
NECK TONE
Diagram #3
TONE
B124rH
4
3
2
1
*
Fender Jazz Bass is a registered trademark of FMIC.
