9 May
2008
9 May
'08
4:51 p.m.
Mike Loewen wrote:
I'm trying to identify a transistor from an early '60s vintage radar
processor panel:
http://sturgeon.css.psu.edu/~mloewen/Oldtech/Panels/Budd-7L.jpg
The transistor is labeled "GT1890G052", and I haven't been able to
find
anything on the web. They're apparently used to switch 3-lead neon
indicator lamps.
I found a few cross-refs for GTxx and GTxxxx numbers, but not specifically for GT1890.
According to these refs, a prefix of "GT" was used by General Instruments,
General
Transistor, and AEI (England).
.. not much help, I know.
Not likely to be very critical though, surely ..figure out whether they're NPN
or PNP and choose an appropriate breakdown voltage (?). I wonder if the 3-lead
neon lamps were used to reduce the breakdown voltage requirements.
