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Hallicrafters SX-25 Super Defiant Receiver


Front of the SX-25 Receiver

Back of the SX-25 Receiver
The Hallicrafters SX-25 Super Defiant receiver was manufactured from 1940 to 1946.  It was touted to have better performance than that of the famed Hallicrafters SX-17 receiver.  Among its outstanding advantages were extreme selectivity and more and better audio.  The design of the crystal filter made possible critical CW operation under trying conditions of intereference.  The sensitivity of the receiver is raised from 2.8 to 4 times in the "CW Xtal" position when the receiver is tuned to the exact resonant frequency of the crystal itself.  Both IF stages are expanded in the "Broad IF" position for high fidelity performance.  The A.N.L. reduces interference by as much as 70%.  The Hallicrafters Super Defiant SX-25 receiver complete with the Hallicrafters PM-23 Speaker, Crystal and 12 Tubes sold for $99.50.  It weighs 46 pounds.

Inside of the SX-25 Receiver  
The Hallicrafters SX-25 covers 5.5 MHz ti 42 MHz in 4 bands.  The separate calibrated bandspread dial for the 10, 20, 40 and 80 meter bands provides frequency meter tuning.

The Hallicrafters SX-25 is a single conversion superheterodyne communications receiver with 12 tubes.  It uses two 6F6 tubes in the audio amplifier section and produces wonderful sound.

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