Sixty years ago this month, the July 1966 issue of Electronics Illustrated showed how to make this 40-watt transmitter for 40 meters. It was geared mostly to the needs of the Novice, but a General-class operator could certainly make good use of it. The main feature was the fact that ten crystals were mounted internally, meaning that one could quickly change frequency with the flip of a switch.

It uses a 6CL6 oscillator and 6DQ5 final. No power transformer is required, since it uses a voltage-doubler circuit to supply the B+. Voltage is kept off the key with a relay. It is equipped with a spotting switch to quickly find your new frequency after switching crystals.