Hammarlund "Super Pro" SP-400-X AM broadcast band and full-coverage Shortwave radio, covers 540 Kilocycles, to 30 Megacycles (and not those silly newfangled "hertz" things).

This is just the radio section, it weighs in at 73 pounds, and has 16 vacuum tubes inside. The front panel is 17.5 inches wide, and the enclosure is 19 inches.

In 1946-1948, it was the most technically advanced receiver available.

The separate power supply is another approx 60 pounds, and has two rectifier tubes, and lots of big, heavy transformers and chokes.

"From 1946 to 1948, Hammarlund produced the SP-400 Super Pro for the amateur radio market....All the models are 18-tube (16 in the receiver, 2 in the separate power supply), single conversion superhets with 2 RF stages and 3 IF stages operating at 465 kHz. In addition to a 5 position single-crystal filter with variable phasing, the IF selectivity is continuously variable between 3 and 16 kHz. The radios are equipped with full bandspread on all except the 0.1 to 0.4 MHz bands, variable BFO, diode noise limiter, and 14 watts of audio output power. Claimed sensitivity is 1.0 to 1.7 microvolts on the LF and HF ranges. The main dial calibration is 1/2 of 1 percent of the highest frequency on each band. Total power consumption is about 180 watts. Initially, two versions were manufactured. One tuned from the low end of the broadcast band to 30 MHz, and the other started at 1250 kHz and went up to 40 MHz. SP-400 Super ProThe SP-400 Super Pros were very similar to the SP-200's with the differences being mainly cosmetic. They were only made from 1946 to 1948 and had outboard power supplies like the earlier Super Pros. There were two of them, the SP-400-X which tuned from .54 to 30 MHz, and the SP-400-SX which tuned from 1.25 -40 MHz"