Seventy years ago, this young woman was tasked with providing the high fidelity audio system for some important event, and she carried out the assignment by constructing this high-power low-distortion amplifier from the February 1953 issue of Popular Mechanics.

The amplifier, suitable for use with any high-quality speaker system, put out a respectable twenty watts with two 6L6’s running push-pull, with only 5% intermodulation distortion (IMD). At ten watts, the IMD was well under 1%.

The set boasted seven tubes, including rectifier, and as shown here, it was easily portable.