Kora
21 March 2026
Kora Class A audio amplifiers are powered by SquareTube, a tube/transistor design that is not a traditional tube gain stage combined with a transistor power section, but a fully hybrid system that simultaneously uses vacuum tubes and transistors. In essence, the tubes provide the signal voltage (the actual music signal) while the transistors provide the current (the power). Whereas Kora's more modest amplifiers are Class A/B designs, the big Class-A amplifiers combine SquareTube with pure Class A transistor power from a highly filtered linear power supply.
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9 July 2022
Kora TB140 Integrated Amplifier
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The Kora TB140 is one of those rare products that truly surprise. It sounds nothing like a stereotypical tube amplifier but neither does it sound like a traditional transistor amplifier.
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