Hi Ted,
I’m currently reading Doug Self’s Small signal book in which he ascribes the Superbal input stage to David Birt of the BBC (ref to a paper presented at the IOA 1990 Windermere conference)…Which is rather puzzling as I thought it was one of your designs from the 70’s….I remember Steve Dove enthusing about it at an Aprs show I think (age you know)…can you set the record straight please.
It’s great to see clssics like the 828 and STM8 being discussed….Does anyone have a working ABCM?
Tim