Just received a copy of "A Flick of the Switch, 1930-1950" from Amazon for $2.99 paperback. A great read for anyone interested in boatanchor receivers and transmitters from 1930-1950. http://www.amazon.com/Flick-Switch-1930-1950-Morgan-McMahon/dp/0914126105/ref=sr_1_2?s=books&ie=UTF8&qid=1422118387&sr=1-2&keywords=a+flick+of+the+switch