The Model 722 excels in every requirement for a truly satisfactory VFO under the crowded conditions encountered today in the Ham bands. It provides full coverage of the five Ham bands from 80 to 10 meters in six ranges, the 10 meter band being covered in two ranges. Basic design features include a low-heat silicon diode doubler power supply, a buffer-multiplier output stage, a very large and easy-reading slide rule dial, and a velvet smooth and extremely reliable drive. Output is high enough to drive any modern transmitter on all bands from 80 through 10 meters. A lever type spotting switch is provided on the front panel. High stability is achieved by carefully coordinated electrical, mechanical, and thermal design. The oscillator is an electron-coupled, series-tuned Clapp type, incorporating a stable, slug-tuned coil and temperature-compensating capacitors. Drift due to internal heating of the tank circuit has been made negligible by the choice of a high L to C ratio, which reduces the circulating tank current to a very low value. The buffer-multiplier stage performs as a "straight- throughTt buffer-amplifier on 80 meters, and a multiplier on all higher bands. It provides excellent isolation between the output load and the oscillator, as well as high output. A VR tube eliminates any effect due to line voltage variation. A rigid mechanical construction and the use of a double bearing on the main tuning capacitor avoids mechanical causes of frequency shift. Enclosure of the frequency-determining elements of the oscillator in a shielding compartment provides both heat isolation and shielding from outside mechanical movements and body capacity.