-=> Mike Ross said to Greg Mayman
 -=> about "*BIG* TRANSISTORS" on 01-02-04  21:12.....

 MR> {at}PID: BWMAX2 3.20 [Reg]
 MR> {at}MSGID: 1:167/133.0 3ff629d9
 MR> "Greg Mayman" bravely wrote to "Roy J.
Tellason" (02 Jan 04  08:17:00)
 MR> --- on the heady topic of "*BIG* TRANSISTORS"
 
 -=> Roy J. Tellason said to Greg Mayman
 -=> about "*BIG* TRANSISTORS" on 12-25-03  04:06.....

 MR> That's true. I've only run across some really strange small devices
 MR> once or twice which I was hard pressed to identify which leads were
 MR> which. One device turned out to be an SCS, a Silicon Controlled Switch,
 MR> basically a PNP and NPN transistors in series (C-p to B-n & B-p to
 MR> C-n), sort of like an SCR except you can turn it off.

Were they also called Gate Controlled Thyristors, or something
like that, or am I thinking of another device entirely?

 MR> Another was in a batch marked as RF transistors. It had a relatively
 MR> low static HFE, and I really couldn't figure out which was the
 MR> collector or emitter but the clue was that in most transistors the

I've seen that with a few RF transistors.

Years ago there was a whole range of symmetrical transistors
brought out. We used some as audio switches.

 MR> collector to base has a slightly higher resistance reading on an
 MR> ohm-meter. To make things worse it even had a diode from emitter to
 MR> collector sort of like the damper diode built into horizontal output
 MR> transistors. 

Yes, that can make the ohmmeter tests very confusing 

From Greg Mayman, in beautiful Adelaide, South Australia
   "Queen City of The South"    34:55 S  138:36 E

... Government always expands to absorb revenue, and then some.
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