This is a Sturmey Archer GH-6 dynohub from 1956. It was rescued from a skip by my dad and although we really have no use for it, it’s nice to clean it up, take it apart and have a look.
It was in its original moss-ridden rod brake rim with a lot of broken spokes.
Before crud removal
After crud removal.
Dynohub logo. The text ' Do not remove magnet without keeper' is a bit cryptic, it means dont seperate the magnet from the armature unless you have a big iron plug called a keeper. This maintains the magnetic field in the magnet. Best to just not seperate them.
Date stamp. (September 1956)
Removing the magnet fixing screws after undoing the locknuts (tiny little bolts and washers on these)
The magnet & armature removed. These should be kept together, if they are separated then the magnet will lose half of its power in an instant.
Inside the shell – filthy.
All cleaned up.
Back together and giving it a test. It works perfectly even after 54 years. I’m not planning on using it for anything as it’s basically redundant compared to modern dynamo hubs. But it’s a nice piece of historic kit and doesn’t deserve to be in the skip.