Help to identify a vintage top-hat transistor

(I'm sorry I have to post in English.)

Hello everyone. I am trying to identify a transistor used in an experimental electronic organ that was built 1956-1961. The builder started with a Conn organ, but I have not yet conclusively identified which model. This transistor seems to be like the 2N269, but the case appears to be bakelite and not metal, and the "hat" definitely has a narrow but distinct brim. There is an orange teardrop shape on the top. I have uploaded the best photo I have of one of these transistors.

[image]

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I have seen them in the 70's , these were American i supose ,These were sold at Tandy/Radio Shack.

--
Cees PA1DBA

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Probably these transistors : type 71226 NPN Si transistors.
[image]
Unfortunately sold.
https://www.ebay.com/itm/276775925599

You could also ask the question on https://antiqueradios.com/forums/
Maybe you can still find them there.

Regards, Armand

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If it really is an NPN silicon transistor you can prolly safely replace it with a BC547B. Or 2SC2240. Verify pinout though.

Tjerk

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Armand: Yes! I haven't been able to see a flat part, but otherwise that is _exactly_ what they look like! Thank you!

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the 2N269 was a PNP GE transistor, in metal case.

Since this is a plastic case, which is more common for Si transistors, I would first define if it is a Si or an Ge transistor, easy to do by measuring the EB voltage drop.

I the 50'ies Si transistors where not common, but, the organ might have had rework later on?

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It seems like a transistor from at earliest the 1960's or more likely 1970's. The case may have originated in the US (1960's) and then be used in Asia (1970's), though that's a bit specualtive and based on vague memories.

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kris: I have not yet determined that it is safe to power on this instrument, so I won't be able to do any electrical testing until that is possible.

Please see Armand's comment. I'm almost certain that he has found exactly what these are. I know for sure that the organ was built 1956-1961. It was a modified Conn organ which had these transistors; I'm still trying to identify the Conn model.

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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?

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