The Model 406L is a broadband solid state power amplifier covering the frequency range of 150 KHz to 250 MHz. Over 5 watts of RF power can be produced at the output, with low harmonic and intermodulation distortion. A highly linear Class A design, the Model 406L will amplify inputs of AM, FM, SSB, pulse and other complex modulations, with minimum distortion. The 40 dB gain of the unit permits it to be driven to its full power output by any signal or sweep generator capable of supplying a minimum -3 dBM (.15 volts RMS) signal level into its 50 ohm input. Virtually all commercial signal and sweep generators are capable of supplying this signal. The Model 406L operates over its entire bandwidth without tuning or other adjustments. It is capable of supplying useful power output up to 270 MHz, at reduced gain. The unit is unconditiona1ly stable and will not oscillate for any possible combination of source and load impe- dances. It is protected against failure due to output load mismatch and/or overdrive. The Model 406L will withstand a +16 dB overdrive (input signal of 1 volt RMS) for all output load conditions including both short and open circuit loads. Output RF voltage level, as well as power output into 50 ohms, is monitored by a front panel meter. An integral power supply permits operation directly from the AC line.