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Amplifier History: The JBL SA-600

Amplifier History: The JBL SA-600

January 12, 2018 · by Bonsai · in Amplifiers, Power Amplifiers, Useful Audio Links

The beautifully styled JBL SA-600 amplifier was launched by the James B. Lansing company in 1966, and Bart Locanthi (the designer) wrote the  technical article linked to at the bottom of this write-up in January 1967. I’ve included this in…

Feedback: A Short History

Feedback: A Short History

October 27, 2017 · by Bonsai · in Useful Audio Links

“Why, sometimes I’ve believed as many as six impossible things before breakfast.” ― Lewis Carroll, Alice in Wonderland     A Future Without Feedback by Martin Colloms There is no mysticism in amplifier design, just serious science. —Andrey A. Danilov Introduction You…

The Tale of Two Recordings

The Tale of Two Recordings

December 11, 2016 · by Bonsai · in Useful Audio Links

I thought I’d share my thoughts with you on the sound of two LP’s I recently acquired.   Many of you will have heard of the term ‘sound wars’ which has been coined to describe the relentless increase in the use…

JLH 10 Watt Class A Amplifier

February 13, 2016 · by Bonsai · in Power Amplifiers, Useful Audio Links

This is a copy of the original John Linsley-Hood article that appeared in Wireless World in 1969. This design, almost 50 years old, is still built in its hundreds all over the world.  A quick root around on the web…

Class A Buffering the Correct Way

February 2, 2016 · by Bonsai · in Audio Design Library, Useful Audio Links

Here’s a simple way to force an opamp output stage to run in class A when used with a discrete buffer output stage – it takes just 1 resistor to provide a near constant current source load. Operating the opamp…

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