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Hallicrafters SX-28 Restoration - Thomas Bonomo K6AD
https://californiahistoricalradio.com/restorations/hallicrafters-sx-28-restoration/
Don’t miss Bill Feldman’s excellent articles in the February and March 2005 issues of Electric Radio titled “The Refurbishment and Modification …
Aargh. SX-28A modifications - Antique Radio Forums
https://www.antiqueradios.com/forums/viewtopic.php?t=285850
A change implemented early in SX-28 production changed from the original Lamb circuit which used V10 as a full wave rectifier following the V9 noise amplifier and T5; to a half-wave rectifier using 1/2 of V10 and a modified T5 - freeing the other …
SX-28 NOTES - radioblvd.com
https://www.radioblvd.com/SX28Notes.html
Audio Output Impedance - Hallicrafters' speakers require 5000 ohm Z audio, which the SX-28 provides, but if you want to use some other speaker you would probably opt for the 500 ohm Z output with a matching transformer. The Super-Pro is usually 600 ohm Z and the HRO is 7000 ohm Z requiring an audio output transformer (usually mounted on the speaker frame in …
Hallicrafters SX-28 - Ohio University
https://people.ohio.edu/postr/bapix/SX28.html
A later version of the SX-28A is also distinctive, using a 6AB7 instead of a 6SK7 as the second RF amp. Details of that modification are in the 16th Rider volume. Both the SX-28 and the other SX-28A version also use the 6AB7 for first RF and Lamb noise silencer amplifier. However the earliest SX-28 uses the 6SK7 for all of these functions.
SX-28 - Crypto Museum
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 .
Hallicrafter SX-28 restoration log - QSL.net
https://www.qsl.net/iw1dhi/sx28/restor-log/restoration%20log.html
The entire power supply has been rewired; filter caps mounted on the original clips. Metallic cans connected via a single wire to the chassis (it is a not original arrangement – see discussion "help on some SX-28 wiring" on rec.radio.boatanchors). Go to the top of this page | …
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