"flipper" wrote in message
...
On Sat, 27 Nov 2010 20:18:05 -0000, "Ian Field"
wrote:


"flipper" wrote in message
. ..
On Sat, 27 Nov 2010 16:06:17 -0000, "Ian Field"
wrote:


"flipper" wrote in message
m...
On Fri, 26 Nov 2010 16:07:10 -0600, John Fields
wrote:

On Fri, 26 Nov 2010 13:04:24 -0800, "Artemus"
wrote:


"flipper" wrote in message
news:hv20f65tahl597f69q7v3dg8o88fvrt8bd@4ax .com...

Comes from never throwing anything away. I've still got my 1985
Signetics Linear LSI Data and Applications manual (because it had
so
many app notes).


I have the same affliction. I still have apps & data books going
back to my 1973 National Linear Apps Handbook.
Art

---
How about this beauty?: (needs a new spine...)

---
JF

That beats my 1964 G.E. Transistor manual.


I'd be very interested if anyone has any old Mullard data sheets; OC,
AC,
AF
etc.


Sorry, don't have any Mullard.

Does ring a bell though. Back when I was a young whipper snapper I
might have used one of the OC line in a 'talking on a light beam'
science fair project but all I can remember is the 'cost saving trick'
was to scrape black paint off the transistor body so it could be used
as a photo transistor. Sounds like maybe an OC7 (or 71, 75, etc).


A common trick with the OC71 but Mullard started using opaque grease to
protect the substrate assembly.

Oh yeah, su "to protect the substrate assembly."

The original 'grease' looked a lot like silicone grease, it was transucent
but still reduced sensitivity a little.

Magazines of the day sometimes published ideas for centrifuging the
transistors to move the grease to the header end of the encapsulation, one
suggestion was cut a length of wood so it can jam in the drum of a spin
dryer - clamp the transistor to one end and spin the grease off the crystal.

The opaque grease resembled blu-tack - if you ever managed to shift it, it
took the bond wires with it.