Gibson pioneered electric guitar in the 1930's, and, consequently, amplifiers, as well. During the mid-1940's, amplifier development was put on war hold. By 1950, Gibson was a MAJOR amp manufacturer, with a philosophy of building warmer, mellower, less compressed amplifiers than their competition, you-know-who. By the mid 1960's, Gibson had lost the amp war, but, from 1947 through the late '60's, the Kalamazoo plant turned out a wide array of models; ranging from little, metal-tubed blues screamers to large, powerful, bells-and-whistles-laden jazz amps. Demand and prices for Gibson amps is increasing, even in today's challenging market.