AO-1 Sine or Square Wave Generator Coverage from 20-20,000 Hz in 3 ranges. Variable 10-v output level @ 600-ohms impedance. Thermistor-controlled linearity, precision multiplier resistors. Distortion less than 0.6%. Weight: 11 lbs Dimensions: 13 1/8" x 8" x 7 1/8" 1953 price: $24.50