Hallicrafters SX-117

Lore & Background

The SX-117 was a triple conversion receiver that used crystal-controlled first and third conversion oscillators, with a second oscillator variable from 6 to 6.5 MHz. It featured a product detector for SSB, a notch filter, and selectable bandwidths of 0.5, 2.5, and 5 kHz. The receiver employed 13 vacuum tubes plus solid state rectifiers and included a noise limiter. For frequencies below 3 MHz, the HA-10 LF/MF converter was available as an optional accessory at $24.95. The receiver had an antenna impedance of 50-75 ohms unbalanced and audio output impedance options of 3.2 ohms or 500 ohms, with audio output power of 3.5 watts (W.P.P.) at 3.2 ohms. Sensitivity was listed as greater than 0.5 to 1 microvolt.

Reader's Guide

The Hallicrafters SX-117 represents a significant model from the 1960s, offering triple conversion design and crystal-controlled oscillators for stable reception on amateur bands and general coverage. Its inclusion of a product detector for SSB, a notch filter, and selectable bandwidths made it suitable for both amateur and shortwave listening. The receiver's ability to cover frequencies from 85 kHz to 30 MHz in 500 kHz segments, with the optional HA-10 converter for lower frequencies, extended its utility. The SX-117's use of 13 vacuum tubes and solid state rectifiers reflects the transition period in receiver technology. Its legacy lies in its combination of features—such as the triple conversion architecture and crystal-controlled oscillators—that were advanced for its time, and it remains a notable example of Hallicrafters' communications receivers from that era.

Did You Know?

• The SX-117 was introduced in 1962 at a price of $379.95.
• It used triple conversion with crystal-controlled first and third oscillators.
• The optional HA-10 LF/MF converter cost $24.95 and allowed reception below 3 MHz.