The Fender Pro Reverb is a high-end guitar amplifier

Guitar amplifier

A guitar amplifier is an electronic amplifier designed to make the signal of an electric or acoustic guitar louder so that it will produce sound through a loudspeaker...

 made by Fender. It was in production from 1965 and was discontinued in 1982. The Pro Reverb is a 40-watt tube amplifier

Valve audio amplifier

A valve audio amplifier or vacuum tube audio amplifier is a valve amplifier used for sound reinforcement, sound recording and reproduction....

 (at 4 ohms) and has a pair 12" speakers; however, models later than 1976 were increased to 70 watts.

The Pro Reverb is most often used by players seeking a traditional Fender clean tone, with, owing to the relative low output power, propensity for 'breakup,' or musically-pleasing distortion. Many players note the quality of the tube driven spring reverb and tremolo (inaccurately referred to as "vibrato

Vibrato unit

A vibrato unit is an effects unit used to add tremolo to the sound of an electric instrument, most often an electric guitar. Vibrato units may be individual stomp boxes or built in to multi-effects units, but are traditionally built in to guitar amplifiers....

" by Fender).

Pro Reverbs were first sold in mid-1965. Since CBS bought out Fender in January of 1965, all of them are post-CBS Fenders. Even so, some have "Fender Electric Instruments Co." on the front panel under the Pro Reverb Amp logo instead of the CBS era "Fender Musical Instruments."

All the original Pro Reverbs are "blackface" -- they have black control panels with white lettering, script logo, silver/black/white grille cloths, raised Fender logo on the grille cloth and black Tolex covering. They use two 5881/6L6GC power tubes, a GZ34 tube rectifier and are rated at roughly 40 watts. They have two channels, one of which has reverb and tremolo. A dual footswitch controls the effects. In excellent condition, with original speakers these amps were selling for between $1900 and $2400 in 2010(2011 Vintage Guitar Price Guide). Mint examples usually sell for more.

In 1967 Fender changed styles. The front panel was polished aluminum ("silverface") and blue block lettering. The grille cloth now blue threads added. The cabinet grew an inch in depth, about the same in height, and became more angular around the front panel. An aluminum trim strip surrounded the speaker panel for roughly one year. The circuitry stayed the same as the blackface amps until roughly 1968 when CBS added their ill-received modifications; the worst of these were removed by 1969. These amps were selling in 2010 for roughly $1200 to $1900(2011 Vintage Guitar Price Guide).

Around 1974 a master volume control with pull boost was added and, two years later, three way EQ and the replacement of the tube rectifier with a solid-state

Solid state (electronics)

Solid-state electronics are those circuits or devices built entirely from solid materials and in which the electrons, or other charge carriers, are confined entirely within the solid material...

rectifier and an increase in output to 70 watts and in 2010 these were selling for around $1200 to $1500(2011 Vintage Guitar Price Guide). The "ultra-linear" solid-state rectifier versions are perhaps the least desirable of the Pro Reverbs, along with the later 1980-era blackface versions,
They were discontinued in 1982.