Vacuum State dpa300B Power Amplifiers
This is getting monotonous! This is the third year in a row I’ve given product of the year to an amplifier, and the second year in a row that title has gone to Allen Wright’s Vacuum State dpa300B Fully Differential Amplifier. There’s a good reason. If you review my previous article, AA Chapter 52, I had the original set built for Vaic VV-32 tubes, because I had multiple sets hanging around from my first adventure with SET amps. The amps were so good, I decided to have a set built for normal 300B’s. Allen’s circuit innovation is to design a magic box (his words, not mine) to turn a push-pull circuit into a full differential output stage. While other amps and preamps use a differential circuit for the input or driver stages, he claims that this is the first design to be able to do this with the output stage, except for a tube power amp used in German atomic power plants for accurate positioning control of the power rods…
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February 20, 2012
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