"Don Pearce" wrote in message
...
On Sun, 4 Nov 2007 14:43:36 -0000, "Fleetie"
wrote:

I did have some (kinda) OC71 transistors, but they were more
modern-looking than the originals; they were called OCP71, I
think, and were blue plastic at the bottom, and then they had
the glass bulb filled with gel. They were about the same size as
AC128, and also had long bendy wires on them.

After they filled the OC71 with opaque gel so you couldn't scrape the
paint off and use it as a photo-transistor, they came out with the
OCP71, where the P stood for Photo. This was again filled with the
clear gel, and I think it had a small lens moulded into the side to
help gather the light.

d

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I have an OCP71 hre, and it doesn't have a lens. I haven't used one for
years, but I recall that at the time, I used to leave the leads nice and
long so the whole transistor could be twisted for maximum sensitivity. In
fact, as the gel is translucent, light entering gets diffused, and the
sensitivity is relatively uniform so one got only a modest increase in
sensitivity rotating the device.

S.



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