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All items tagged with Gregory L. Charvat (2)
A Portable Tube Preamp
December 13, 2017 by Gregory L. Charvat

A Portable Tube Preamp

In this amazing project by Gregory L. Charvat, two pre-amplifiers are used with a battery powered high voltage supply. The high voltage supply works by creating a square wave with a 555 timer. The square wave is fed into a small audio power op-amp. The output of this op-amp is back-fed into the secondary of an audio output transformer, generating high voltage AC 170V at 40 kHz. This signal is rectified, filtered, and regulated in a conventional sense. The entire system runs on 8 AA batteries and should operate for approximately 4 hours continuously. This article was originally published in audioXpress, March 2010.
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It’s Here! The Glass Audio DIY Special audioXpress May 2015 Edition!
March 31, 2015 by audioXpress Staff

It’s Here! The Glass Audio DIY Special audioXpress May 2015 Edition!

The Glass Audio Special edition is a tradition we have retained since the former title was merged with other magazines to become audioXpress. audioXpress still publishes tube-related articles, but we feel this is one of the highlights for our readers and it certainly is among our authors due to the amount of articles we receive — increasingly addressing applications outside of the typical high-end living-room stereos.
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