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Hallicrafters SX-28 Restoration - Thomas Bonomo K6AD
https://californiahistoricalradio.com/restorations/hallicrafters-sx-28-restoration/
The SX-28 is undoubtedly Hallicrafters’ finest pre-World War II radio (excluding Hallicrafter’s special dual diversity DD-1). This radio came from the …
Hallicrafters SX-28A was there ever a mod to convert …
https://forums.qrz.com/index.php?threads/hallicrafters-sx-28a-was-there-ever-a-mod-to-convert-them-over-to-mini-tubes.239178/
Unfortunately the clean one as had a series of mods done to it where about 1/2 the tubes have been replaced with mini receiving tubes. It's to bad as it almost looks new. Had anybody ever heard of a mod to convert the tubes to a newer design? I've searched the net and haven't spotted anything.
Hallicrafter SX-28 restoration log - QSL.net
https://www.qsl.net/iw1dhi/sx28/restor-log/restoration%20log.html
Maybe it was a good mod… but my interest now is to restore the radio as electrically original as possible. So I decided to reverse the mod. Here is the empty V11 socket ready for rebuild according to the original Hallicrafters design. Wanted to check T4 internal conditions. Dismounted T4 loosening the two nuts between V11 and V12 sockets.
SX-28
https://www.cryptomuseum.com/df/sx28/index.htm
Other design features of the SX-28 are the Amplified Automatic Volume Control (AVC), the Lamb Noise Silencer, Calibrated Bandspread and Push-Pull Audio. The SX-28 was developed in 1940 and was intended to be the 'ultimate receiver' of the moment, using the input from over 600 report, filed by Radio Amateurs and Government Engineers [1] .
Hallicrafters SX28 v SX25
http://www.redwaveradio.com/4_14c0e7fda29e46b2_1.htm
detector mod to perform well on SSB; several effective & simple mods were published at various times in CQ & QST older issues. Otherwise, to many of us, the SX-28/SX28A is sort of a vintage "Cadillac" and the SX-25 a "Chevrolet", if you know American autos a bit. Nicknames were "Super Defiant" (SX-25) and "Skyrider" (SX-28). Frank
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