The Model 4200 Oscillator is a low-priced solid state laboratory or production signal source with performance available only in units selling at twice the price. It provides a sine wave over the range from 10Hz to 10MHz with 0.5 watt of power at less than 0.1% distortion. An infinite resolution dial and push-button multiplier provides rapid and continuous frequency tuning. The half waft of power over the entire range is outstanding for a general purpose test oscillator, and this coupled with an excellent frequency response of 0.025 db, makes the Model 4200 ideal for meter calibration, response measurements and amplifier testing. Amplitude calibration of 0.2db accuracy is obtained by an 8 position push-button attenuator calibrated in 10db steps. A continuous output control combined with the attenuator provides 90 db of attenuation. The 50 ohm impedance minimizes signal losses due to resistive and capacitive loading and the half watt of power is essential for driving loads without overloading. Unavoidable capacitive loading limits the usefulness of any oscillator without low internal impedance and high power output capabilities. A fixed 1 volt output independent of the main output can be used for synchronizing a scope or as an auxiliary output. For increased frequency accuracy, a synchronizing input is available to lock the Model 4200 to a precise external frequency source. Careful attention to packaging design, rugged construction and use of all silicon transistors makes this unit insensitive to vibration and shock. The Model 4200 with its broad frequency range, flat response, clean signal and low price, is ideally suited for laboratory and production applications.