audioXpress - May 2023

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