The Heathkit AR-3 was a radio introduced in 1956 to be a shortwave and broadcast AM receiver.

4 bands:
A: AM Broadcast 550KHz-1500KHz
B: AM Shortwave 1.5MHz-4MHz (Includes ham 160m and 80m)
C: AM Shortwave 4MHz-11MHz (Includes ham 40m and unofficially 60m)
D: AM Shortwave 10MHz-30MHz (Includes ham 20m, 15m, 10m, CB; and unofficially 17m, 12m)

5 tube superheterodyne receiver:
12BE6 Pentagrid Converter
12BA6 IF amplifier
12AV6 Demodulator and first audio/BFO
12V6 Power output
5Y3 Rectifier with isolation power transformer

AM demodulation only.

I picked up this radio from a thrift shop in shambles. A tube was missing. Knobs were missing. Chassis was loose. Well, it was cheap so I took a gamble. Fortunately the Heathkit AR-3 manuals are online, so that helped figure out the proper tube locations as they were moved around, and the missing tube: the 12AV6 detector was missing. I had a spare 12AV6 so I put it in, and used all my spare knobs: and the radio pretty much worked just fine as it was. As there is no antenna, an external antenna is required. Since the radio uses virtually the same AM tuner path as my Westinghouse, they sound similar, just the AR-3 doesn't have a back cover to make a sealed enclosure and output tube differs (though both use beam power tetrodes (12V6 vs 50C5)). The difference between the two radios? The other picks up VHF FM (and uses a 12DT8 as the VHF oscillator and RF amplifier), this one picks up HF shortwave.