FENDER ’63 VIBROVERB (USA) (1 Pc)

Description

2X10” OXFORD SPEAKER COMPANY SPEAKERS, 40 WATTS

Brownface, brown Tolex.
The original (6G16 circuit) Vibroverb was introduced in February 1963, the speaker lineup and the output transformer were based on the Fender Super amp of the time, the circuit based on the Fender Vibrolux of the time, with no presence control and only one 12AX7 tube for the tremolo effect. It sported typical “brownface” cosmetics, with brown “Tolex” covering (introduced by Fender in 1959), and wheat-colored speaker cloth.

The 40-watt amplifier boasted two channels (NORMAL and BRIGHT). Both channels had VOLUME, TREBLE and BASS controls; the single-control REVERB affected only the BRIGHT channel.

The tremolo effect (labeled VIBRATO by Fender, see “VIBRATO or TREMOLO?” section of the article vibrato unit) had two controls, SPEED and also INTENSITY, which affected the bias of the output tubes and therefore both channels. To make room for the reverb circuitry (not found on the Super amp) the company used the direct-coupled oscillator vibrato circuitry found on Fender’s previous generation tweed amplifiers (which used two tubes fewer than the Super’s brownface vibrato circuit).

The TREBLE control was the same as found in many Fender amplifiers of the time (i.e., Pro Amp -6G5A-, the Super -6G4A-, the Showman -6G14-, the Vibrolux -6G11-). It was fitted with a “tapped” treble circuit, meaning that the treble control is “flat” at setting “5”; cutting or boosting the treble was possible by turning the knob down (below “5”) or up (above “5”), respectively.

2×10″ speakers manufactured by the Oxford Speaker Company.

Tube complement:
Power:…………6L6GC (Two)
Preamp:………..7025 (Two)
Phase Inverter:…7025
Rectifier:……..GZ34
Tremolo/Vibrato:..12AX7
Reverb Driver:….12AX7
Reverb Recovery:..7025

PART NUMBER: 120V 21-7200
100V 21-7270
230V 21-7260
230V UK 21-7240
230V NORDIC 21-7280
240V AUSTRALIA 21-7230
DIMENSIONS: Height:19-3/8” (49.2 cm).
Width:25” (63.5 cm).
Depth:8-5/8” (21.9 cm).
WEIGHT: 46lbs (21kg).
POWER OUTPUT: 40 watts R.M.S. minimum into 4 ohms.
OUTPUT IMPEDANCE: 4 ohms.
INPUT IMPEDANCE: Input 1, both channels: 1M ohms.
Input 2, both channels: 136k ohms.
FEATURES: Tube generated power amp Vibrato in both channels, Reverb in the Bright Channel.
Tilt-back legs.
POWER REQUIREMENTS: 100VAC – 50/60 Hz, 270 watts.
120VAC – 60 Hz, 270 watts.
230VAC – 50 Hz, 270 watts.
240VAC – 50 Hz, 270 watts.
SPEAKER COMPLEMENT: (2) 10” Oxford Speaker Company speakers with 7DF paper cones
and surrounds, 1-1/4” voice coils, and kraft paper coil formers like
the original Vibroverb speakers (part number 037076).
SOUND: Legendary.