by Frank Stroupe ***WARNING-There are voltages inside of a tube guitar amp that can KILL you.There are components in the amp that hold live current long after the amplifier is unplugged.The Fender Pro Reverb is a high-end guitar amplifier made by Fender.
Model/Circuit Number: AC568, AA769, AA270 Years of Production: 1968 – 1982 Era: Silverface Configuration: Combo Controls: Silver, forward facing w/ blue labels Knobs: Black skirted w/ chrome center, numbered 1 – 10 Faceplate Bias: Fixed, adjustment pot or balance pot Rectifier: Solid State Comments: A master volume was added in 1972.
Other late seventies circuit changes included a Line Out jack, hum balance pot, and a pull boost sw.
Many players note the quality of the tube driven spring reverb and tremolo (inaccurately referred to as "vibrato" by Fender).
At a time when Fender was increasing the wattage of most of its tube amps in an attempt to provide players with cleaner tones at higher volumes, the Pro Reverb was somewhat unusual in the Fender lineup due to its relatively low power output (prized by today's players) and smaller output transformer, which gave the Pro Reverb a "dirtier" sound than most of its contemporaries.
This is intended to be an informative article for the uninformed, and is purposely not terribly specific.
I'm also not going to get too deeply into technical details of circuitry.I recently purchased a 1972 Silverface Champ for 40 bucks.I am not an expert on amps, Fender amps, or Silverface Fender amps. I am merely someone that loves old gear, appreciates Silverface amps, loves to write, and loves history.I apologize in advance if I got a date wrong, a model wrong, etc.Its pretty hard to get extremely accurate information on the history of Fender amps..several reasons..someone will always criticize the specifics.Fender switched back to the blackface era cosmetics some time in 1980.