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Device Identification Assistance

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German Ron:
Hi,

I discovered a few of these in a bag of junk a colleague of mine gave me when he retired some 20 years ago.

They're a strange package, which I don't recognise, and I'm curious to know what this package is too.

They appear to be marked 6-5910 / ECC 074. I don't think they're a valve though.

Any ideas?

Thanks very much :)

jmelson:

--- Quote from: German Ron on February 14, 2021, 02:40:16 pm ---Hi,

I discovered a few of these in a bag of junk a colleague of mine gave me when he retired some 20 years ago.

They're a strange package, which I don't recognise, and I'm curious to know what this package is too.

They appear to be marked 6-5910 / ECC 074. I don't think they're a valve though.

Any ideas?

Thanks very much :)

--- End quote ---
They are almoist certainly a dual rectifier in a press-fit package, that has been pressed into a TO-3 adaptor.  And, likely, about 40 years old.

Jon

Benta:

--- Quote from: jmelson on February 14, 2021, 05:10:49 pm ---They are almoist certainly a dual rectifier in a press-fit package, that has been pressed into a TO-3 adaptor.  And, likely, about 40 years old.
Jon

--- End quote ---

More likely a three-phase rectifier for an automotive alternator exciter. And most certainly more like 50 or 60 years old.

bob91343:
Could also be an SCR.  Put it on one of those Chinese all purpose little testers.

Benta:

--- Quote from: bob91343 on February 14, 2021, 06:26:30 pm ---Could also be an SCR.  Put it on one of those Chinese all purpose little testers.

--- End quote ---

A possibility I also thought of, but the fact that the three terminals are the same size led me to reject it. All SCRs I've seen in this style have a small terminal for the gate.
Press fit was popular in automotive designs back then, with the case being one terminal. This would mean that an SCR would have one large terminal and one small.

The OP should use a diode tester on it at least. That might bring illumination.

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