Production Year 1940 at $159.50
The Hallicrafters SX-28 is a 15 tube 6 band receiver that covers .54MHz to 43MHz. The radio uses an I.F. of 455kHz. The features on this receiver include a BFO, a Variable strength ANL, S Meter, Main Tuning dial lock(not installed on all models), Variable IF Selectivity(Broad, Medium, Sharp), Crystal filter, Two stages of RF Amplification and a Calibrated Bandspread.
The front panel is a thick piece of heavy steel which is painted black and has engraved lettering and imitation leather graining. The power source is 120 volts AC or 120-240 volts AC at 25 to 60 cycles with the use of a universal power transformer. There is also a provision made for a 6 volt DC operation with the optional Vibrapack. The matching speaker for this radio is the Hallicrafters PM-23 or the monster R-12 console.
The tubes and their functions are as follows, a 5Z3 = Rectifier, two 6V6 tubes in a Push-Pull Audio output, 6SC7 = 1st Audio, 6J5 = BFO, 6H6 = ANL, 6AB7 = ANL Amplifier, 6B8 = AVC Amp, 6B8 2nd Detector & S Meter Amplifier, 6SK7 = 2nd IF, 6L7 = 1st ANL Amplifier, 6SA7 = Oscillator, 6SA7 = Mixer, 6SK7 = 2nd RF Amplifier and a 6AB7 as the 1st RF Amplifier.
Another neat feature of the radio is that on the back there is a phone jack for use with an external sound source such as a record player. Yes, the 6V6 in push pull configuration sounds that good. It is the opinion of this author that the SX-28 is the finest pre-WWII Hallicrafters shortwave receiver.
Many of these receivers saw service during the War. The SX-28 and its sister VHF models, the S-27 and S-36 are often pictured as rack mounted in British government listening posts for monitoring the German radar and other communications. The FBI also used these to monitor the airwaves for clandestine communications. After the War, the SX-28 and SX-28a were used by the FCC to monitor domestic radio transmitters. A Radio News 1946 picture shows one installed in an automobile equipped for monitoring by the FCC. This receiver has a massive history behind it. The SX-28 series of receivers is one of my all time favorites hands down. They are true "boatanchors" weighing in at a good 75 pounds. Oh I almost forgot, besides all of the above, they just look great!!
This receiver was built around August of 1943.