Note
The Hallicrafters 8R40 is a single conversion superheterodyne receiver introduced in 1950. It's a tabletop radio with a built-in speaker, known for its solid construction and performance. It is essentially a copy of the S-40B with modifications to reduce the cost, making it both appealing and affordable for the shortwave listener.
The 8R40 was designed for general-coverage listening, including the standard AM broadcast band and three shortwave bands, covering frequencies from 540 kHz up to 44 MHz. It was a step up from basic consumer radios, featuring eight-tubes and a more robust design.
Key features of the 8R40 include a BFO, an RF gain control, a three-position tone switch, and a RADIO-PHONO switch for direct access to the audio amplifier.
The radio was known for its two IF stages, which provided better selectivity than many consumer-grade radios of the time. The 8R40 and its console cabinet variant, the 8R40C, were part of Hallicrafters' post-war product line aimed at both the serious shortwave listener and the budding amateur radio enthusiast.
The Hallicrafters manual did not include much in the way of specifications. The S-40B should provide some a few details.
Features / Specifications
– Speaker: 5-inch PM
– Voice Coil Impedance: 3.2 ohms
– Antenna Provisions: Terminals for single wire or doublet antenna
– Frequency Coverage: 540 KC to 44 MC
– Intermediate Frequency: 455 KC
Tube Lineup (8 total, 7 metal)
* 6SG7: RF Amplifier
* 6SA7: Converter/Mixer
* 6SK7: 1st IF Amplifier
* 6SK7: 2nd IF Amplifier
* 6H6: Detector/AVC/ANL
* 6SC7: Audio Amplifier/BFO
* 6K6GT: Audio Output
* 5Y3GT: Rectifier
Power Supply: 105–120 VAC, 50/60 Hz, 75 watts
