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Old 26th November 2006, 10:44 PM   #1
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Default TO3 puzzle

TO3 case


markings:

M (obviously Motorolla)
769521
259-4
7940



I know meaning of first and last lines,but rest.........?

anybody have some info?
datas,EU equivalent........
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Old 3rd December 2006, 01:52 AM   #2
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Not recognizable as any Motorola part number; it's most likely an in-house number for some equipment manufacturer, made and/or selected to specification for them by Motorola. You'll have to use an ohmmeter to measure the diode drops to tell if it's bipolar and NPN or PNP, for example. A curve tracer could probably tell you something about gain and breakdown voltages. After that, who knows? It looks like a 1979 date code, so that helps narrow down the possibilities a little bit.

Do you know what sort of equipment it came from? Is the case aluminum or steel?
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Old 3rd December 2006, 10:45 AM   #3
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Quote:
Originally posted by Damon Hill
Not recognizable as any Motorola part number; it's most likely an in-house number for some equipment manufacturer, made and/or selected to specification for them by Motorola. You'll have to use an ohmmeter to measure the diode drops to tell if it's bipolar and NPN or PNP, for example. A curve tracer could probably tell you something about gain and breakdown voltages. After that, who knows? It looks like a 1979 date code, so that helps narrow down the possibilities a little bit.

Do you know what sort of equipment it came from? Is the case aluminum or steel?

exactly same thoughts I have....
anyway-it's more like puzzle,not really that I'm so desperate ,so I just have small hopes that someone have handy real data....
look here :http://www.diyaudio.com/forums/showt...98#post1070998

tnx!
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