On my walk to work today (I didn't ride as rain was expected and I had the child seat on my Orangebike) I encountered no fewer than five Raleigh Superbes. A Superbe is a fairly common sight on the streets of Toronto, both the gentlemen's version as well as the lady's step through frame. I usually happen across one or two a week, but five in one day is exceptional.
|Superbe from an eBay auction|
|Another beautiful example from this blog.|
|Another Superbe from mytenspeeds.|
|Dynohub advert from SA heritage site.|
The Sturmey Archer GH-6 Dynohub was the centerpiece of this system and it preceded the recent glut of contemporary hub dynamos by more than 60 years. Introduced in 1945, it was in production until 1984 according to this Sturmey Archer heritage site. It is often mistakingly rated the same as contemporary hub dynamos ( 3W @ 6V) but it actually puts out around 1.8W @ 6V. I've confirmed that my GH-6 saturates at about 330-330 mA, which is consistent with the later power rating.
|The Sturmey Archer GH-6 Dynohub. My favorite hub in the whole world.|
Photo from Sheldon Brown's Dynohub article.
|Product photo from Sturmey Archer. Oddly, the front hub has been placed in a rear drop out.|