Fender Rumble Bass - Channel; Mid; B Volume; Treble

J. CHANNEL - Selects whether Channel A and Channel B are to be separate (SWITCH) or mixed
(COMBINE) together before being sent to the speaker jacks.
K. MID - Selects whether pre-set mid frequencies are to be attenuated in Channel B.
L. B VOLUME - Adjusts the volume of Channel B.
M. CHANNEL INDICATOR - When this red LED is illuminated, Channel B is selected.
N. TREBLE - Adjusts the level of high frequencies in Channel B.
O. BASS - Adjusts the level of low frequencies in Channel B.
P. MIDDLE - Adjusts the level of mid frequencies in Channel B.
Q. MIX - The MIX control becomes active only when the Effects Loop is enabled. This control
determines the amount of “wet” signal (post effects device) to be mixed with “dry” signal. When
the control is rotated fully counter-clockwise the signal sent to the speaker jacks is completely
“dry”. When the control is fully clockwise the signal sent to the speaker jacks is completely “wet”.
R. PILOT LIGHT - When this lamp is illuminated the amplifier is receiving power. Should the lamp
burn out, turn off the amplifier and unplug it from its power source, unscrew the red jewel, and
replace the lamp with type T47 light bulb.
110
29
38
47
56
110
29
38
47
56
110
29
38
47
56
110
29
38
47
56
110
29
38
47
56
MADE IN U.S.A.
B VOLUME TREBLE BASS MIDDLE MIX
C
OMBINE
SWITCH
C
HANNEL MID
FENDER MUSICAL INSTRUMENTS
NORM
CUT
J
KLM
N
O
P
Q
R