Transistor amplifiers, which had been in their infancy in the early 1970s, developed at a prodigious rate as the decade progressed. Driven by new semiconductor devices and fundamental circuit research, performance steadily improved while prices fell. A crowded marketplace meant the bigger players each offered something unique in order to differentiate their products. This often came in the form of special output devices or, as was the case with the JVC A-X4 of 1980, novel topologies.
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