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Reference

Posted by Paul Joppa (P) on February 9, 2009 at 21:42:01

In Reply to: good detective work.... posted by mqracing on February 9, 2009 at 12:42:01:

Audio Anthology volume 3, page 16ff. "The Maestro - a POWER amplifier," Sarser and Sprinkle. Audio Engineering, 1952, originally. (For those who don't know, that journal split into Audio Magazine and the Journal of the Audio Engineering Society a few years later.) This is real historical Golden Age stuff.

Here's an excerpt:

"... so a conference was held with E. B. Harrison, of Peerless. On hearing the problem hesaid, "I think I can do it." Subsequently he has admitted it was a tough one. However, Harrison designed and built an output transformer for the 6146, and although originally built especially for this first amplifier, it is now in the Peerless line as type S-268-Q."

The amp itself is Class AB with the accent on B - quiescent current 58mA, full power 254mA. So he transformer primary halves must be very tightly coupled indeed. The transformer, tested with a matched impedance rig, is down 1dB at 10Hz and 100kHz. 800 henries at full power, leakage 7mH. Wow.

Last I heard, several years ago, David Sarser is still around and would LOVE to get his hands on a pair of these.

I would speculate that a pair of 845s in deep class A, no feedback, would be spectacular with this. Anybody up for a "Seth on steroids"? Be afraid - be very afraid!

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

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