sentences:  The Fender Blues Junior was introduced after the Fender Pro Junior, but has entirely different circuitry and uses two EL84 output tubes rather than Pro's four, although both are rated at 15 watts.Like many Fender amplifiers (particularly in the Hot Rod series), many limited edition versions of the Blues Junior have been manufactured since its introduction in 1995.The original circuit board underwent a major redesign in 2001, when production moved from the US to Mexico.