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Günter Vogl

Günter Vogl

hello, I am writing to you from the south of Germany ( not too far away from Munich). Now I… More...
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user99

user99

A BIG thanks. To Nelson Pass for being so generous in an age obsessed with knowledge hoarding. To Peter Daniel… More...

Zen Variations 7 — Nelson Pass / 2004

One of the performance issues raised by the original Son of Zen (Audio Electronics, #2, 1997) was its efficiency figure, which was charitably described as 4% (500 watts in, 20 watts out). You may recall that this was dictated by the original requirements - no feedback, no capacitors in the signal path, and a single gain stage. Zen Variation 6 relaxed the requirements on feedback and capacitors in order to provide a tutorial exercise about “super-symmetric” feedback. The performance was improved in distortion and output impedance, but the efficiency was only slightly improved, largely because we used most of the… More...

Amp Camp Project — Pass DIY / 2016

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