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Source of Germanium transistors, old Ma Bell touchtone phone

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12-15-2013, 05:08 PM

wa2ise

VideoKarma Member

Join Date: Dec 2002

Location: USA

Posts: 3,147

Source of Germanium transistors, old Ma Bell touchtone phone

Looks like that transistor used in the old touch tone keypads is Germanium. It measures around 0.25V BE and BC junctions with my DVM in diode mode. Though mine dated back to 1974, that should still be Germanium. It's PNP.

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I was a wrong number at the phone company...

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touchtonepadgetransistor.jpg (29.2 KB, 128 views)

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