Hi All,
Rooting about in my junkbox, I came across a Regulator 6B, and I'd like to know what it's for.
It's a 1974 Post Office item, Rate Book (is it still called that?) Item Code 434915. About 3ins (8cm) long, it appears to comprise solely of an inductor, or at least some wound component, and two zener diodes.
I think it may have some connection to a Jack Unit 1A or 1B, which housed the same circuitry as a 700 series telephone, into which one plugged a headset for use on, typically, a Works Order/Circuit Provision desk.
Googling has proved fruitless - any information appreciated.