Date: Mon, 11 Dec 2000 18:39:07 +0000 (GMT) From: ard(a)p850ug1.demon.co.uk (Tony Duell) Subject: Re: Fw: Professors worry that engineering students don't tinker involved). You started out making a crystal set, then added a single audio stage (OC71), then a second stage (another OC71), then added a loudspeaker (using an LT700 output transformer). And finally you replaced the crystal detector with the OC45 regenerative stage. I think the book is still around, even if the transistors are hard to find now. I remember the son of a technician at a place I was working a few years back was building one -- I managed to find him some OC71s. I thought just about all UK hobbyists built this at one time or another...