The SSB Adapter is a filter type SSB generator capable of operating on all amateur band SSB frequencies between 3,8 to 29.7 megacycles with an approximate output of 2 watts. The equipment is designed for use with the Valiant I and II utilizing the Valiant's VFO for frequency control and last two stages for power amplification. All the Adapter R. F. stages are bandswitched and pretuned except for the amplifier tank circuit. The 1st and 2nd mixer stages utilize the 7360 tube capable of long term stability and suppression of at least 40 db. The 7360 tube is also used as a combined crystal oscillator and balanced modulator providing a high degree of stable carrier suppression. The crystal filter is the same as used in the Viking Invader transmitters with the same stable operation and sharp response. The output stage consists of a "Pi” network with a fixed 50 ohm output impedance. The audio system includes a fixed audio oscillator for use during tuning adjustments. The two stage audio amplifier has an excellent response and is designed for use with a high impedance microphone. The control circuits provide for MANUAL, VOX and P.T.T. operation of the Adapter and the Valiant transmitters. The filament and plate voltages to operate the Adapter are provided by a separate power supply. All the cables necessary to connect the Adapter to the power supply and to the Valiant transmitter are furnished with the Adapter.