The Fender Pro Junior is a guitar amp manufactured by Fender Musical Instruments Co. It is the lowest-priced model of the Hot Rod series and has a 10" Eminence Speaker. It contains a pair of 12AX7 preamp tubes and two EL84 Groove Tube output tubes.
While the amp's small size makes it convenient for practicing, it has also been used on-stage by some notable guitar players, including Jeff Beck, and Mike Sullivan of the band Russian Circles.
Fender Pro Junior Wikipedia
The Pro Junior was introduced in 1993 along with several other popular Fender guitar amplifiers including the Fender Blues Junior and the '65 Deluxe Reverb Reissue.
In 2001 production of the Hot Rod Series amplifiers ( including the Pro Junior and Fender Blues Junior, etc.) was moved to the Ensenada factory in Mexico.
The Pro Junior III Series was announced on September 9, 2010 with the following updates:
"All Hot Rod III series amps include easier-to-read black control panels, new badges, “dog bone” handles, heavy-duty chicken-head knobs and LED jewel lights." One 10" Special Design Eminince 8-ohm speaker
Single Channel Controls
Unique clean-to-gain volume control