Fender 3965 Twin Reverb Owners Manual - Page 7

`65 Twin Reverb - Rear Panel A B CD EF G A. POWER CORD - Connect the power cord to a grounded AC E. MAIN SPEAKER - Plug-in connection for speakers. A receptacle in accordance with the voltage and frequency 4-ohm minimum speaker must always be connected at this ratings shown on the rear panel of your amplifier. jack when the amplifier is ON to prevent damage to the amplifier. B. FUSE - Protects the amplifier from electrical faults. Replace a blown fuse only with same type and rating as listed on F. EXTERNAL SPEAKER - Plug-in connection for an external the fuse holder. If the amplifier repeatedly blows fuses, speaker. This jack is wired in parallel with the MAIN take the amplifier to an authorized Fender Service Center. SPEAKER JACK {E}. A total speaker impedance load of C. POWER - Switches the amp ON and OFF and completely disconnects the apparatus from the mains. 4-ohms should be used to avoid damage to the amplifier. G. FOOTSWITCH - Plug-in connection for the FOOTSWITCH D. STANDBY - Use STANDBY instead of switching POWER off which enables ON/OFF switching of the VIBRATO and for short breaks to eliminate the tube warm-up delay upon REVERB effects. The footswitch must be connected returning to play. This will also extend tube life span. and switched on for the Vibrato effect to function. CHASSIS FIG. 1 BOTTOM VIEW A B Tube Adjustments If the sound quality of the amp has degraded noticeably the tubes may be worn and need replacement. Output tube typically need replacement before pre-amp tubes. If you are not sure about the condition of your tubes or the following procedures, take your amplifier to an authorized Fender Service Center. Replace tubes with identical Fender® original equipment only (see SPECIFICATIONS below). Tube location is printed on the tube label, inside the cabinet. A. HUM BALANCE ADJUSTMENT - This adjustment minimizes the hum heard at the speakers due to tube filament imbalance. •Adjustment Instructions: Turn the amplifier ON for 2 minutes with nothing plugged into any of the INPUTS. Rotate the VIBRATO CHANNEL volume, middle, and bass knobs fully clockwise and the treble knob fully counter-clockwise. Rotate ALL of the NORMAL CHANNEL knobs fully counter-clockwise. Switch OFF the REVERB and VIBRATO effects. Insert a slotted screwdriver into the BALANCE ADJUSTMENT control, (see "A" in FIG. 1) and rotate back and forth to the position with the least amount of hum. B. BIAS ADJUSTMENT - This adjustment should be made only by an authorized Fender Service Center. BIAS needs adjustment only if the replacement output tubes are not identical to the original tubes. Specifications TYPE: PR 186 PART NUMBER: 021-7300-000(120V,60Hz)USA, 021-7360-000(230V,50Hz)Euro, 021-7340-000(230V,50Hz)UK 021-7370-000 (100V, 50/60Hz) Japan, , 021-7330-000 (240V, 50Hz) Australia. POWER REQUIREMENTS: 360 watts POWER OUTPUT: 85 watts R.M.S. IMPEDANCES: SPEAKER COMPLEMENT: INPUTS 1: 1M ohm (both channels), INPUTS 2: 136k ohms (both channels) OUTPUT: 4 ohms (both speaker jacks together) Two 12 in, 8 ohm Jensen® (P/N-057146) TUBE COMPLEMENT: OUTPUT: Four Fender Special Design 6L6GC's (P/N-039214), PRE-AMP: Four Fender Special Design 12AX7A's (P/N-013341), Two Fender Special Design 12AT7's (P/N-023531) DIMENSIONS: HEIGHT: WIDTH: DEPTH: 19-7/8 in 26-5/32 in 10-3/8 in WEIGHT: 64 lb Product specifications are subject to change without notice. (49.2 cm) (63.5 cm) (21.9 cm) (29 kg) 7