Really good selection of reference books from days gone by. Several publications of radio experimentation. Thought you were tough 'cause you built your own tube amp? How about building your own tubes! These books are just plain fun.....Colin

• http://www.lindsaybks.com/

I especially liked these:

Bob Jorgensen's Steam Auto, Motorcycle & Engines

Vince and Dave Gingery's Boundry Layer Effect Tesla Turbine

Radio Experimenter

Hydrogen: Fuel from Water

Distillation and Rectification of Alcohol

Model Engineering

Van de Graaff and other High Voltage Generators