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Old 27th November 2012, 08:09 AM   #1
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Default Capacitors

Can somebody plse identify these,
Some has ITT and STC marked on them, some have electrolytic marked on them. Stantelum is on some of them as well. Can they be used in audio or should they go to the bin !

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Old 27th November 2012, 10:02 AM   #2
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From the manufacturer's name and the capacitance/voltage rating on the top unit, I would hazard a guess that they are tantalum. Some types are better than others, but given their apparent age I'd be cautious using them.

They do superficially resemble polystyrene caps, but I'm pretty certain they are tantalum electrolytics.
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Old 27th November 2012, 11:55 AM   #3
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Wet tantalum. Typically very expensive; they combine low leakage, high capacitance in a very small case size.

Good for audio? I'm not so sure; application is everything. They are designed for things such as analog timing circuits. Not suitable for power supply use.
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Old 27th November 2012, 12:53 PM   #4
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The smaller one is marked 0.5uF 150V. I don't recall Tantalums rated that high and capacitance that low (though I haven't seen that much) I also don't see a polarity marking (Tants are polarized).
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Old 27th November 2012, 01:17 PM   #5
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Thanks for all the replies,
These are supposedly more than thirty years, they still test OK and very close to their supposed values with a capacitance meter. Some show polarity and some not. Will they be usable for something like a coupling cap on the input of an amplifier ?

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Old 27th November 2012, 03:44 PM   #6
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Isn't that a NATO stock number on them, they are mil spec.
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Old 27th November 2012, 08:01 PM   #7
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I wouldn't know, they were used as spares for microwave transmission here in South Africa , just thought they were of any value, everything was made better in the olden day's.The equipment they have been used on were analog and have been taken out of service a couple of years ago.

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