@larrykell wrote:
True Class A amplifiers require large power supplies, huge heat sinks, have many output devices, consume lots of electricity, and generate a lot of heat. They’re expensive to build. My Colosseum has 48 Sanken bipolar transistors and can generate 160w at 8ohms and 1250w at 1 ohm. It’s all Class A. There can be no crossover distortion because the transistors never turn off. I think the sound is glorious and that there is no substitute for Class A amplification.
That’s one massive beast of a Class A amplifier - not to mention the power bill it produces..! I know, because I too am very fond of true Class A amplifiers. There’s this effortless smoothness/liquidity and natural warmth to a good such amplifier that’s addictive. The Class A amplifier I’m using is only 30W/8ohms, but it also only handles frequencies from ~600Hz on up, actively, while looking directly into a 111dB sensitive compression driver and its associated horn. Suddenly 30W gets you a long way - if it even outputs more than a single watt or two, indeed typically only a fraction of it and with all that entails with regard to miniscule distortion levels. With a closer to "normal" 91dB sensitive pair of speakers, passive at that, one would need 3kW to - on paper - equate the SPL-scenario of the 111dB/30W combo mentioned, driving a passive full-range load at that. One shivers by the thought of a 3kW true Class A amplifier...