YouTube creator Jazzy Jane has posted a video resurrecting a current dumping amplifier dating from the mid-1980s, and explains how the circuit works.
A current dumping amplifier combines a small class A amplifier with a much larger class B one, using feedback to remove the crossover distortion that would otherwise occur with the class B design.
The restored unit is a neatly built device with a wooden base, consisting of a power supply, RIAA pre-amp board, and the amplifier itself.
Jane replaces capacitors in the power supply that had failed, though notes that the replacements are also period-correct and turn out to be problematic as well.
The item’s unusual nature and revival are outlined, and readers are invited to compare this amplifier with previous items Jane has working on and featured in Hackaday articles.
