audioXpress - May 2023

In this issue

FROM THE EDITOR’S DESK—Make It Worth It, by J. Martins, p. 4
The Hypex NCORE NCx500 Amplifier Module: Doubling Down on a Flagship, by Stuart Yaniger, p. 8
Learning Audio Testing and Measurements, by Jan Didden, p. 18
The Vanderveen Trans PP80 Valve Amplifier, by Menno van der Veen, p. 20
A (Z)OTL with 300Bs: Part 1 — The Makeover, by Thomas Perazella, p. 30
Myths in Tube Circuit Designs, by Peter Dieleman, p. 38
Vintage Op-Amp Noise Simulation: Part 2 — Calculations and Noise Sources, by Burkhard Vogel, p. 44
Monoblock Power Amplifier with Precision Bias Control: Part 2 — Circuitry, Mechanical Design, and Measurements, by Bruce E. Gillingham, p. 50
Power Transformer Parameters, Selection, and Testing: Part 7 — A Few Transformer Core Types and Their Advantages and Disadvantages, by Chuck Hansen, p. 59
HOLLOW-STATE ELECTRONICS—A Trip Down Memory Lane: Electric Guitar Amps, by Richard Honeycutt, p. 63

The Hypex NCORE NCx500 Amplifier Module

NCORE (NC) amplifier modules are the flagship product from Dutch manufacturer Hypex Electronics and its success among the high-end audio brands is well documented. In 2022, Hypex announced the introduction of its improved NCOREX technology, starting with the NCx500 OEM module, which audioXpress received for review

10+ mins

The Vanderveen Trans PP80 Valve Amplifier

This new push-pull (PP) valve amplifier, featuring the Trans technique, delivers 80W power, refined resolution, valve-sound envelopment, and low distortion plus good speaker damping. And... the amp is simple to construct

10+ mins

A (Z)OTL with 300Bs: Part 1-The Makeover

Rebuilding an amplifier for reasons of better reliability, better aesthetics, or bringing it up to the latest standard can be very rewarding. And if it is a classical, technological grandstand, even more so. Thomas Perazella embarked on such an adventure with a famous David Berning ZOTL amplifier. In Part 1 of this article, Tom presents the amplifier and discusses its unique circuitry. In Part 2, he will proceed to dismantle and rebuild the amp for the new owner and place it in a new chassis

10+ mins

Monoblock Power Amplifier with Precision Bias Control

In Part 2, Bruce Gillingham discusses the remainder of the MB1's circuitry, its mechanical design, and its performance measurements

10+ mins

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audioXpress Magazine Description:

Step into the realm of audio, sound technology, and the latest developments in the field with audioXpress Magazine. We're delighted to introduce you to this publication, your ultimate source for all things related to audio, audio equipment, and the art of sound reproduction.

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