Tag: EF3

Amplifier History: The JBL SA-600

12 January 2018

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 (link further down) in January 1967. This is one of the earliest – if not the earliest – example of a commercial amplifier that addressed the potential for TIM/SID and…
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Ovation e-Amp: A 180 Watt Class AB VFA Featuring Ultra Low Distortion

2 February 2014

The e-Amp is a 180 Watt RMS (very conservatively rated into 8 Ω ) fully balanced symmetrical (‘FBS’) amplifier featuring an emitter follower triple (EFT) bipolar output stage and beta enhanced VAS stage. The amplifier can be configured using jumpers for TMC (Transitional Miller Compensation) or straight Miller compensation (MC). The VAS can be lightly…
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Ovation 250 Power Amplifier

15 January 2014

The Ovation 250: A 250W per Channel Audio Power Amplifier (updated 1st June 2013). This amplifier was designed and built in 2005/2006 as my first foray back into audio design after a nearly 20-year hiatus, This write-up was originally published in 2009 when I was living in Tokyo, Japan. Introduction Diy Audio is a wonderful activity:- …
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