This market was dominated by companies such as Marshall and Mesa Boogie—both of which had gotten started modifying Fender amps (the Bassman and the Princeton, respectively).
Fender Musical Instruments Corporation | Fender | Freddy Fender | Fender Stratocaster | Fender Telecaster | Fender Jazz Bass | Percy Fender | Fender Bassman | Fender Twin | Leo Fender | Fender Precision Bass | Fender Mustang | Fender Jazzmaster | Fender Nashville B-Bender Telecaster | Fender Bullet | Randall Amplifiers | Fender tweed | Fender Tucker | Fender Telecaster Bass | Fender's blue butterfly | Fender Reverb Unit | Fender Japan | Fender Esquire | Fender Bass VI | Fender Aerodyne Jazz Bass |