This is Hickok’s Model 799, called the "Mustang" because of its modern features which incorporate SPEED into tube testing procedures. The multi-socket design eliminates time-consuming switching, and its solid state circuitry provides accuracy, reliability and light weight. As future tube types require more sockets, accessory assemblies will be made available for insertion into the panel to prevent obsolescence. POWER REQUIREMENTS - 105-125 Volts, 50/60 cycles, 30 watts WEIGHT - 19 lbs SIZE - 19" x 15-1/2" x 6-1/4" deep TUBE DATA - Data for all common tube types appears on the panel, as well as in the data booklet; booklet also includes data for the less common tubes.