It has always seemed to me that all the historic books here are fine, but they nearly all depend on being able to find old, and often fragile bits. The same thought clearly occurred to Tom Lindsay, because this series is intended mainly to show how you can substitute bits. In Vol. 1 there are notes on Vacuum Tube Substitutions, Inexpensive Tube Power Supply, Grid-Leak Detectors, a Regenerative Receiver and more! Vol. 2 subjects include a Grid Dip Oscillator, a Shortwave Converter, a Slow-Motion Dial Drive, Space-wound Coils whilst Vol. 3 include Building an Impedance Bridge, a One-Tube SW Receiver, a Headphone Amplifier, Old-Time Radio Cases etc. Vol. 4 includes: Building a TRF receiver, a One Tube Crystal Converter, Versatile Power supply and a Slide rule Dial. Vol. 5 includes: building a Superhet Receiver, a Coil Winding Machine and a simple Alignment Oscillator, plus all sorts of tricks, tips and secrets. Vol. 6 covers building a Loose-Coupler, an Active Long Wire Antenna, a Regenerative Loop Receiver, transmitter experiments and the like. Useful stuff! Well produced 48 page booklets. Lindsay Publications