Simple Ripple Eater PSU for the sx and kx-Amplifiers
A high quality double sided through hole posted and silk screened PCB for $10.99 (excl. shipping) is available for this power supply from Jim’s Audio here: Ripple Eater PSU for kx and sx Amplifiers Here is an Excel file with…
Hifisonix kx-Amplifier
The Hifisonix kx-Amplifier is a 28 Watt class A DIY power amplifier featuring low distortion, wide bandwidth and fast rise/fall times. It can be operated either in pure class A mode, or in class AAB mode with a lower output…
Amplifier History: The JBL SA-600
The JBL SA-600 amplifier was launched by the James B. Lansing company in 1966, and this article was published in January 1967. I’ve included this in the hifisonix power amplifier library because it is one of the earliest – if…
Ground Loops: How to Wire-up an Audio Amplifier for Zero Hum and Noise
This set of slides is the culmination of my experience over a period of about 25 years building numerous power amplifiers and preamplifiers. I first started out in audio about 40 years ago as a teenager. Some of my creations…
The Endless Semantic Debate: Current and Voltage Feedback Amplifiers
It seems some are still agonizing over the ‘current feedback’ versus ‘voltage feedback’ definition. Clearly a case of people wanting to continue to flog a horse that was laid to rest five decades ago during the heyday of the analog…
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