Help to identify a vintage top-hat transistor (Algemeen)

door Maarten Bakker , Haarlem/Delft, 09-11-2025, 14:28 (3 uur en 34 minuten geleden) @ monz
Gewijzigd door Maarten Bakker, 09-11-2025, 14:30

No need to power it on if you want to test whether the transistor is Ge or Si. Just set your multimeter to diode test and measure across the B-E junction. There's a chance it won't work "in circuit" but you'll find out soon enough.

I'd bet it's a Silicium NPN transistor, though. If there's no printing on it, it could even be a hobbyist type from surplus/outside spec stock. Not sure if it's original as 1959-1961 seems ~10 years early. Are you sure the experiments didn't go on for longer or were performed later?