Thorsten showing the iFi Zen DAC at High End 2019

AMR Altar of HiFi with a full 77 active setup

Presenting the (then) latest iFi product, “big in Japan”

Single-ended valve amplifier theory: Image39.gif — Single-ended valve amplifier theory

Design

Lux91

300B single-ended monoblocks: a WE 91 310A gain stage with a reactive interstage, fixed bias and an all-film-capacitor supply, 16 W from one 300B.

Design

This Is the Lux91, a Western Electric 91 with a Reactive Interstage

300B single-ended monoblocks designed for DIY HiFi Supply in Hong Kong: the WE 91 gain stage, a reactive interstage, fixed bias and a film-capacitor supply, 16 W from one 300B. By Thorsten Loesch.

2 Nov 2026 Lux91 300B Tube Amp Theory