ASR33 selector magnet driver card

Brent Hilpert hilpert at
Mon Mar 19 02:58:41 CDT 2007

Mr Ian Primus wrote:

> It's actually a little blue cylinder (made of glass),
> that has a black band on one end. Should have
> mentioned that before - it looks kinda like a
> germanium diode, but in the schematic they seem to
> have it doing rectifier duty. I've got tons of
> 1N400x's, so I suppose I could try that, it looks like
> it should work, given the circuit. Did they make glass
> rectifiers at one point? (non tube, rectifiers, that
> is...)

Sounds like you have the problem covered but just to answer your question, I
have seen 1N400x rectifiers in that form (glass, painted blue with black
printing) on occasion in older equipment.

(BTW/FWIW: Most of the rest of the 1N4xxx range is zener diodes, all the way
from 1/4W to 100W Pd.)

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