In article , Bob Eager
writes
On Tue, 7 Sep 2004 19:02:44 UTC, "Dave Plowman (News)"
wrote:

OC81 comes to mind. I had some here till recently...

IIRC, OC82 was an output transistor in an ally can. OC71 was the common
general purpose type.

Thinking about it, I'm sure you're right. I remember filing round the
base of the glass, removing it, getting the jelly off, scraping the
glass clean....lo, a phototransistor (terrible characteristic, but...)

Rather than removing the glass/jelly, I once scraped the paint off an
OC71, and centrifuged the jelly to the bottom. Of course, Mullard then
changed to opaque glass, then tin cans.

ISTR the OC71 cost 1/6d (or was it 2/6d ?), whereas the "proper" OCP71
cost 17/6d.

--
Frank Erskine
Sunderland