Thursday, March 10, 2011

Hallicrafters Super Defiant SX-25 and Hallicrafters PM-23 Speaker

I may have brought back a trunk load of equipment from the Hamfest but this was worth the trip by itself.

I purchased the SX-25 from the Greater Houston Hamfest and the PM-23 speaker from Robert's Military Radios

The manual for the SX-25 is available here : Hallicrafters_SX-25_Manual

Robert is a great guy who specializes in military radio hardware and documentation. If you need anything related to military radios go look him up!

Hallicrafters Super Defiant SX-25 and Hallicrafters PM-23 Speaker

Here is some information regarding the SX-25 for your reading pleasure.

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.
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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How many hams from years ago started to save their pennies after seeing this ad ...
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