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Hallicrafters HT-37 amateur transmitter covers 80, 40, 20, 15 and 10 meters in AM(DSB), CW and SSB modes. Power is 70-100 watts input SSB PEP/CW.Production of this unit began in 1960. Hallicrafters HT-37 amateur transmitter covers 80, 40, 20, 15 and 10 meters in AM(DSB), CW and SSB modes. Power is 70-100 watts input SSB PEP/CW.The VFO employs double reduction disc drive, fixed T.C. Sideband suppression is 40 db at 1000 CPS. Power rating is 70-100 watts P.E.P. output CW or SSB. 17-25 watts carrier on AM phone. There are two 6146s in the final. 3rd and 5th order distortion products down 30 db. Carrier suppression is 40 db or better. CAL system has instant CW CAL signal from any transmission mode. Cooling is by convection with final operated at low dissipation in standby. The Hallicrafters HT-37 is the matching unit for the Hallicrafters SX-111 receiver and the Hallicrafters R-48 speaker.*Hallicrafters Model R-48 Speaker