![]() The size of the radio is 21.5 x 12.75 x 17. The SP-600-JX-6 is also known as the R-274B. The SP-600-JX-28 is also known as the R-620. Some of the common military designations for this receiver is as follows. The SP-600-JX-17( as pictured ) is a diversity receiver. Some Variants include the SP-600-J which has no fixed positions. The matching Hammarlund speaker would be the SP-300. The features include a 1/4" Headphone Jack, Signal/AF Meter, IF Output Jack, AVC On/Off, Standby switch, Tuning Lock, 6 Fixed band Positions, Crystal Fine Tuning of ☓ kHz, BFO of ☓ kHz, Internal Power Supply, Flywheel Tuning, RF Gain and a ANL. FRC ( Hammarlund Model SP - 600 - J ) to provide more adequate fusing of the power transformer and to provide better accessibility to the B minus fuse. The SP-600 is single conversion under 7.4 MHz. The tubes and their functions are as follows, two 6BA6 = RF Amp, 6AC7 = FFO, 6C4 = VFO, two 6BE6 = Mixer, 6BA6 = Gate, 6C4 = FFO, two 6BA6 = IF Amp, 6BA6 = Driver, 6BA6 = Buffer, 6C4 = BFO, 6AL5 = Detector & AVC, 6AL5 = Limiter & S-Meter, 12AU7 = IF Out & AF Amp, 6V6GT = Output, 0A2 = Regulator, 5R4GY = Rectifier and a 6AL5 as a Rectifier The Hammarlund SP-600 is a Dual Conversion Super heterodyne receiver using 20 tubes and covering from 540kHz to 54MHz.
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