This is one OTL-1 power supply. It weighed 100 pounds and could regulate 350 volts at 10 amps from Hz to 200 KHZ at full power plus/minus 3%. In effect it is a 5,000 watt solid state amplifier, and each audio channel of the OTL-1 used one of these. This was the first time in the audio arts that anyone ever actively regulated that power supply of an OTL amplifier which is a daunting challenge because this type of circuit, unlike a transformer coupled amplifier, is both high voltage and high current.

Why am I showing you this? When tube amplifier designers say that active regulation doesn’t work, or they can’t do it...nonsense!


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