Thanks for the reply Ripthorn.
First point - I am interested in designing a preamp because I like to learn about stuff and guitar electronics is something I know very little about. However one thing I have noticed is there is an awful lot of inconsistency and misunderstanding on the subject just about everywhere. Hence my request for some facts on the pickups.
I would love to look at your Alembic clone, if for no other reason that one of my fave bass players is Phil Lesh who, IIRR, used Alembic electronics. Could you let me know where I can find the schematics? I am happy with solid state construction and i have a reasonably good workshop with a scope as my other hobby is making radios. The voltages that tubes (or valves as we say over here) are a bit high for me to be confident with so until I learn a bit more I shall stay solid state.
Regards,
Steve