SPEAKER COMPLEMENT:Two 12-inch Fender vintage re-issue Special Design speakers (P/N-037617)
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)
FEATURES:Vibrato and Reverb, Tilt-back legs
DIMENSIONS:HEIGHT:19-7/8 in.(49.2 cm)
WIDTH:26-5/32 in.(63.5 cm)
DEPTH:10-3/8 in.(21.9 cm)
WEIGHT:64 lbs.(29 kg)
Product specifications are subject to change without notice.
`65 Twin Reverb – Rear Panel
The tube BALANCE and BIAS of your ‘65 Twin Reverb is adjusted at the factory and should
provide years of service before needing attention. If the sound quality of the amp has degraded
noticeably and HUM BALANCE and BIAS adjustments fail to restore sound quality, the tubes
are worn and need replacement. Note that pre-amplifier tubes last longer than output 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.
A.HUM BALANCE ADJUSTMENT - This adjustment minimizes the hum heard at the speakers
due to tube filament imbalance. Balance is usually adjusted only when tubes have been
replaced. •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
NORMALCHANNEL knobs fully counter-clockwise. Switch OFF the REVERB and VIBRATO
effects. Then 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 only should be made if the output tubes are
replaced with tubes not identical to the original tubes and should be adjusted only by an
authorized Fender Service Center.
Tube Adjustments
Specifications
Replace tubes with identical F e n d e r® original equipment only (see SPECIFICATIONS below). Tube location is printed on the tube label, inside the cabinet.
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