|This is a rare Hallicrafters R45/ARR7 WWII military receiver
with 6 bands and 12 tubes. It receives AM and CW on-bands: .55 - 1.6 Mc;
1.6 - 3.0 Mc; 3.0 - 5.8 Mc; 5.8 - 11 Mc; 11 - 21 Mc; 21 - 42 Mc. The IF is
455 kHz. It has a BFO, crystal filter, and an output jack for a Panoramic
Adaptor. It was used in World War II and later military aircrafts. The electrical
design is very similar to the Hallicrafters SX-28 receiver, but its appearance
is totally different. It is 8 in. hi X 10 1/2 in. wide X 20 deep and weighs
36 lbs not counting the power supply. This receiver reminds me of the Collins
R-392 conversion of the R-390 receiver.
The receiver initially came with a motorized tuning device mounted on the front panel. This has been removed and a manual tuning knob added. A couple of strips of black tape cover up several holes that were used in attaching the motorized tuning device. There is a stamp on the side of the chassis that has a manufacturing year of 1944, and the front ID tag states "Signal Corps Order No. 631, Day 44, Hallicrafters Company."
The power supply I use is an Airtronics Development Corp. unit. The ID tag states "115 Volt Power Supply, PS-32/AR, Order # 729, Day-45, R.L." It appears that it is a multi-purpose power supply that had been modified to work with the R45/ARR7 receiver.