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The Fender Vibroverb was a 40-watt combo guitar amplifier originally manufactured in 1963 and 1964. It was the first Fender amplifier to incorporate on-board reverb which became a standard feature on many high-end Fender tube amps during the 1960s and 1970s. == Brownface, brown Tolex-the 1963 Vibroverb == 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. It had two ten-inch speakers manufactured by the Oxford Loudspeaker Company. This incarnation of the Vibroverb was made for only a few months, and it is thought that fewer than 600 of these units were made. Tube complement: Power:............6L6GC (Two) Preamp:...........7025 (Two) Phase Inverter:...7025 Rectifier:........GZ34 Tremolo/Vibrato:..12AX7 Reverb Driver:....12AX7 Reverb Recovery:..7025 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fender Vibroverb」の詳細全文を読む スポンサード リンク
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