Details
Date of Manufacture:1940-
Manuals and schematics :
See below links.
Tube and Semiconductor Complement:
15: 6AB7 6SK7 6SA7 6SA7 6L7 6SK7 6B8 6B8 6AB7 6H6 6J5 6SC7 6V6GT 6V6GT 5Z3
Model Notes
Manuals:
http://en.wikipedia.org/wiki/Hallicrafters_SX-28
http://www.radioblvd.com/SX28Notes.html
http://www.antiqueradio.org/halli12.htm
http://www.cryptomuseum.com/df/sx28/