Help to identify a vintage top-hat transistor (Algemeen)

door monz , 10-11-2025, 02:48 (2 uur en 15 minuten geleden) @ Maarten Bakker

At the bottom of p 109 in this article, John Chalmers states: "The culmination of Piehl 's work is a 19-tone electronic organ which was begun in 1956 and completed in 1961." This was shortly after he visited Piehl at his home, so that information came first-hand from Piehl himself.