Such circuits are fairly common in small chips which don’t generate the high current necessary to drive a loudspeaker. This kind of amplifier is known as a power transconductance amplifier. We built an audio current source that delivered 1 amp of AC current per input volt to a maximum of 10 amps. Well, of course entertainment is full of fringe elements.Ī couple of years ago, Kent English and I were playing around with various ribbon tweeters, noting how the ribbons themselves seemed perfectly happy being driven by a current source and without their usual matching transformer. A small minority of audiophiles thinks otherwise, and these are often people using low wattage tube amplifiers with unusual looking speakers. This belief has particularly been dominant since the development of high power solid-state amplifiers that began in the 1960’s. Conventional wisdom holds that a pure voltage source amplifier is ideal for audio applications, and generally designers of loudspeakers work to that assumption.
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