I also have a thread running with the same subject title as this one, so I'll add a link to it to try to keep all the information together in one place:-
http://www.vintage-radio.net/forum/s...d.php?t=138407
There was also some very interesting information on these transistors in that Quad 303 thread which I should have perhaps linked to in my thread, and maybe will do, but I'll link to it here for now:-
http://www.vintage-radio.net/forum/s...d.php?t=137769