User manual FENDER MA6 SOUND SYSTEM

[. . . ] A straight forward Treble-Bass-Mid Tone control section allows for adjustments in tonal balance at frequencies musically relevant to the bass guitar. An effects loop with a mix control to infinitely adjust the amount of external effects is standard, and is switchable, on or off, in both channels. Like the other Fender custom amps, the Rumble Bass is painstakingly built, one at a time, by a select group of craftsmen at the Fender electronics factory in Lake Oswego, Oregon. It is suggested that you read this manual thoroughly to understand all the features and functions of this amplifier. This amplifier will provide years of trouble-free service and playing enjoyment. 4 3 2 1 5 6 7 83 4 5 6 7 83 4 5 6 7 83 4 5 6 7 8 9 NORM A COMBINE NORM 3 CUT MID B SELECT SWITCH CUT MID 92 10 1 10 TREBLE A VOLUME 92 1 BASS 10 92 1 10 MIDDLE 2 A INPUT A/B INPUTS B INPUT CHANNEL A B C D E F G H I J K RUMBLE FRONT PANEL FUNCTIONS A. [. . . ] The two channels are mixed after all tone shaping sections of the pre-amplifier. B INPUT - A high impedance, high sensitivity plug-in connection for Channel B. OMBINE NORM 4 3 2 1 5 6 7 83 4 5 6 7 83 4 5 6 7 83 4 5 6 7 83 4 5 6 7 8 9 WITCH CUT 92 10 1 10 TREBLE B VOLUME 92 1 BASS 10 92 1 10 MIDDLE 92 1 MIX 10 HANNEL MID FENDER MUSICAL INSTRUMENTS MADE IN U. S. A. J K L M N O P Q R 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. MID - Selects whether pre-set mid frequencies are to be attenuated in Channel B. B VOLUME - Adjusts the volume of Channel B. CHANNEL INDICATOR - When this red LED is illuminated, Channel B is selected. TREBLE - Adjusts the level of high frequencies in Channel B. BASS - Adjusts the level of low frequencies in Channel B. MIDDLE - Adjusts the level of mid frequencies in Channel B. 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 switch is off (down) the amplifier is completely shut down. FUSE - The fuse is in the AC supply of the amplifier and will protect the amplifier and the operator in the event of an electrical fault. STANDBY - When in the STANDBY position the amplifier is off. However, the tube filaments are left on as to eliminate warm up time, provided that the POWER switch is on. E. EFFECTS - These switches select whether Channel A, or Channel B, or both are routed to the effects device. When either of the switches is on (up) the signal being sent to the speaker jacks is split. This secondary signal is diverted through the Effects Loop and is placed at the MIX control. EFFECTS SEND - Provides an unbalanced output signal from the pre-amp. This signal is after the tone shaping sections. EFFECTS RETURN - Provides a return from the effects gear. FOOT SWITCH - This jack provides a foot operated switch in which to select Channel A or Channel B. [. . . ] TUBES The Fender Amp Custom Shop Rumble Bass consists of six 6550WA's, four 12AX7's, three 12AT7's and two 12BH7's. For best results, replace with Fender original equipment tubes only. TOLEX COVERING CARE The exclusive Fender Tolex covering on your cabinet is especially designed to provide years of lasting beauty. A very light soapy solution on a sponge may be used to remove dirt and residue that may accumulate in the grain. [. . . ]