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Date Posted by Category User IP

2017-04-15 (UTC)

W5IDX

Receivers

107-196-26-206.lightspeed.hstntx.sbcglobal.net

Hallicrafters SX-73 R-274

High Resolution Pictures at.
https://www.facebook.com/media/set/?set=a.10208897934594239.1073741837.1491285835&type=1&l=496de4f345

Hallicrafters R-274 (SX-73) The elite Shortwave Receiver. This one is complete except for the Lucking mechanism on the Dial and the Knobs, Plays beautifully and comes with some extra tubes. 1250.00 or may trade for a NEW TS-590SG, or a TL-922A or??? Actual
It contains 19 tubes and has a coverage of 540 Khz to 54 Mhz on 6 bands. Like the Hammarlund SP-600 it too has a military designation of R-274. It employs a single conversion superheterodyne circuit between 540 Khz to 7 Mhz, and a double conversion superheterodyne circuit from 7 Mhz and up. The intermediate frequencies for the double conversion is 455 Khz and 6 Mhz, The Hallicrafters R-274 (SX-73) communications receiver was manufactured from 1952 to 1954 for the military-commercial market. This baby weighs 58 pounds and is 20x11x18.5 inches, and fits into a 19 inch rack. audio output of 600/50 ohms and antenna input of 50-200 ohms with a BFO injection control and carrier meter adjustment on rear. The receiver has 6 fixed crystal positions with crystal vernier tuning. Its ranges are: .54-1.35, 1.35-3.45, 3.45-7, 7- 14.4, 14.4-29.7 and 29.7-54 MHz. It has receive/standby, BFO, AVC and ANL switches. The receiver is a double conversion super heterodyne general coverage communications receiver with 17 tubes plus voltage regulator, ballast tube and rectifier, 2 IF and 2 RF stages and is single conversion below 7 MHz. The coils are mounted on a turret and mechanically move into active circuit to reduce cross modulation.

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