The Twiggy Analog board seems to have been redesigned a few times. Schematics for Revs A & B have been found, but are very different from the physical drives found which use Rev F.
From examining a Twiggy analog board Rev F, it uses:
- NE592
- N8T20
- CA3146
- CA3183
- MC34002
- MC1350
- 2N2907
- 2N4393
(+ more common parts)