Hammarlund SP-210 SuperPro
The Hammarlund SP-210-LX is an 18-tube, single conversion superhet receiver. It covers 0.1-0.4 and 2.5-20 MHz in 5 bands. The radio and cabinet weigh a mere 73 pounds (33 kg) while the separate power supply adds another 57 to 61 pounds.
References:
War Department Technical Manual TM11-866, 31 August 1943 "Radio Receivers BC-779-B, BC-794-B, and BC-1004-C and Power Supply Units RA-74-C, RA-84-B, and RA-94-A"
Instruction Book for "Super-Pro" Radio Receiver (100-400 kc and 2.5-20 Mc), overprinted "Radio Receiver BC-779-A and Power Supply Unit RA-84-A", Undated, "Published by Authority of The Chief Signal Officer, Order No. 21109.
"Series 200 Super-Pro by Hammarlund", undated.
"Communications Receivers, The Vacuum Tube Era 1932-1981", 3rd Edition, by Raymond S. Moore
Rack-mount version of the SuperPro 210-LX
Hammarlund Series 200 Technical Data
Hammarlund Series 200 Performance
SuperPros at War! (Well, Cold War, with the emphasis on cold). Recent (1950!) photo of Airman J.C. Stott, AC5ZT, tending to two SuperPro and two Navy RBA receivers at the Narsarssuak, Greenland, USAF base.
Francesco Piva's Hammarlund Super Pro page. He has a number of other interesting older receiver's under the Hobby heading of his home page.
Eberhard Hewicker's BC-779-A. Here is the full size image. Eberhard has also created modern schematic drawings, which can be found on the Technical Data page.
Additional BC-779 images from Google Image Search
Excellent Southern California Antique Radio Societey articles about Hammarlund Super-Pros and their use in the Alaska Communications System.