The Hallicrafters SX-28 Website


My 5th radio

Stuff you only need to read once:

5th Radio Resurrection - A diary of the attempt to make the 5th radio functional.
 Antenna Trim Control - An explanation of the path from knob to variable cap in the rear of the radio.
 Alignment - Alignment of early radios. No procedure exists yet for new radios.
 AVC BFO Switch Wiring - How to wire the AVC BFO switch.
 Band Switches for SX-28 - Everything about the band switch in the early radios.
 Band Switches for SX-28A - Everything about the band switch in the late radios.
 Band Switch Detent Issues - There appear to be two types of detent mechanisms and the early ones are usually broken.
 Band switch shaft positioning - How to install the band switch rod.
 Band Switch Wafer Orientation - A page to help you understand wafer orientation .
 BFO Knob Adjustment - How to make sure the BFO knob is correctly installed.
 Cleaning metal pieces - How to clean up a bare chassis or RF cap cage.
 Check tube filaments - One method to see if the tubes are at the right temperature.
 CPR - How to deal with a radio that's supposed to work but doesn't.
 Docs - A bunch of downloadable documents. If you have one not listed here and would like to share...
 Dummy Antenna - Needed for alignment.
 Dummy Load - A dummy load for working on partially assembled radios.
 Easy Access to Front Panel Parts - Neat way to get to some of those hard to reach parts bolted to the front panel.
 For Sale (Small Parts) - List of Hallicrafters SX-28 parts available.
 Identify Your Radio - Early? Late? A version? Not A version?
 Identify The Tuning Caps - Reference with photos for the big tuning caps.
 Knobs - Notes on knobs from all radios. No point seen in maintaining which knob came from which radio.
 Original Radios - A series of pages with photos and some commentary on the five radios so far part of this project
 Parts List - Working on a new parts list.
 Radio Trivia - Some interesting bits about the path from radio's beginning to the SX-28.
 Repair T6 - The attempt to repair T6.
 Repair Damaged IF Can - Notes on repairing damaged T5 can. Suitable for any can.
 Reader's Projects - Notes and pictures submitted by readers. Please feel free to add to it.
 Remove the Radio From the Case - How to safely remove the radio from the case.
 Restoration Links - A bunch of links to stuff other people have published.
 Selectivity Switch Knob Adjustment - Make sure the selectivity switch knob is properly installed.
 Square Coil Tuning Slugs - An examination into which coils have slugs and which don't.
 S Meter - A description of the S Meter.
 S Meter Explosions - The S Meter has issues.
 Screw Reference - An attempt to identify which screws belong where. This is a daunting task.
 Schematics - Several different versions of the schematic for the my new SX-28.
 Soldering Notes - Some comments on soldering you might not know.
 Short Power Cord - If you're doing a lot of work on a radio, this power cord idea will make your life easier.
 Selectivity Switch - Installing the selectivity switch and close by components.
 Shielded wiring - Notes and pictures on the shielded wiring including how to reproduce with modern parts
 Tube filament wiring - Notes on wiring the filaments plus tube diagrams.
 Tube Extender - An 8-pin octal plug and socket to allow measurements on pins of a tube.
 Two Tuning Dials - So what's the deal with two tuning dials?
 Transformer Resistance Tables - Precise four wire ohmmeter readings for the various RF, IF transformers.
 Tuning dial differences - An explanation of the two styles of tuning dials.
 Tools - Some comments on useful tools, solder, etc.
 T1 - Notes on T1.
 T2 - Notes on T2.
 T3 - Notes on T3.
 T4 - Notes on T4.
 T5 - Notes on T5.
 T6 - Notes on T6.
 T7 - Notes on power transformer T7.
 T9 - Notes on RF 1 coil T9.
 T10 - Notes on RF 1 coil T10.
 T11 - Notes on RF 1 coil T11
 T12 - Notes on RF 1 coil T12.
 T13 - Notes on RF 2 coil T13.
 T14 - Notes on RF 2 coil T14.
 T15 - Notes on RF 2 coil T15.
 T16 - Notes on RF 2 coil T16.
 T17 - Notes on RF 2 coil T17.
 T18 - Notes on RF 2 coil T18.
 T19 - Notes on mixer coil T19.
 T20 - Notes on mixer coil T20.
 T21 - Notes on mixer coil T21.
 T22 - Notes on mixer coil T22.
 T23 - Notes on mixer coil T23.
 T24 - Notes on mixer coil T24.
 T25 - Notes on oscillator coil T25.
 T26 - Notes on oscillator coil T26.
 T27 - Notes on oscillator coil T27.
 T28 - Notes on oscillator coil T28.
 T29 - Notes on oscillator coil T29.
 T30 - Notes on oscillator coil T30.
 RF Gain Pot - The RF Gain pot underwent a major reposition from the earliest radios. This page has pictures.
 V1 (1st RF module) - Available info about this tube.
 V2 (2nd RF module) - Available info about this tube.
 V3 (mixer) - Available info about this tube.
 V4 (osc module) - Available info about this tube.
 V5 (1st IF amplifier) - Available info about this tube.
 V6 (2nd IF amplifier) - Available info about this tube.
 V7 (2nd det & S meter) - Available info about this tube.
 V8 (AVC) - Available info about this tube.
 V9 (noise amp) - Available info about this tube.
 V10 (noise rect) - Available info about this tube.
 V11 (BFO) - Available info about this tube.
 V12 (audio preamp) - Available info about this tube.
 V13 (push pull audio output) - Available info about this tube.
 V14 (push pull audio output) - Available info about this tube.
 V15 (rectifier) - Available info about this tube.
 Wire Tagging - A neat way to keep track of what went where.
 Wafers - A guide to the various switch wafers in the radios.
 Wire Color - How to figure out wire color when everything is brown.

The links below go to the older pages about the author's radios.
They're left here because someone might find some use in them.

Power Supply - Notes on power transformers and wiring my version of the power supply section.
 I Need Help With This - RESOLVED.

June 6th 2026 status:
Working on completing unfinished topics