Quote:
Originally Posted by BottleMan
I seem to remember that TI (Bedford) were making power silicon-diffused mesa transistors for use in TV line output stages (e.g. BUY69A) and if I remember correctly they were making experimental parts, hence the unusual number, with a higher breakdown voltage for use in a sequential-colour (10kV for orange/16kV for red) radar display. If the base and emitter terminals have more than the usual glass insulation around them it could be one of these. The other giveaway is a very low current gain ~less than 5 at 1A. The numbers either side of the logo form the date code as mentioned.
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I'm wondering if this is the same as was mentioned in "The Setmakers", where the Thorn TV-designers, having decided to do an all-semiconductor colour TV, found that the high-voltage TI transistors (which had originally been specified for a military radar) failed distressingly-often in the LOPT and EHT-generator stages and they were "steadily filling glass sweet-jars with burnt-out transistors at £14 a time" ??
[See page 379 of "The Setmakers" for more...]