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:

SX-28 IF ALIGNMENT PROCEDURE

SX-28A User Manual

SX-28 Service Manual

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/