Greg Erskine wrote: 
> When I was a kid there were pyramids you could buy to keep your razor
> blades sharp. What happened to pyramid power?
> 
> Has this advanced technology been used in audio?

'Nagra PSA (Pyramid Stereo Amplifier)'
(http://www.tonepublications.com/review/nagra-psa-amplifier/)



"To try to judge the real from the false will always be hard. In this
fast-growing art of 'high fidelity' the quackery will bear a solid gilt
edge that will fool many people" - Paul W Klipsch, 1953
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