Semiconductor Continuity Checker
The Tektronix Semiconductor Continuity Checker was probably made in 1974. It resembles the continuity checking part of the Hy-Tronix 900, which is described in US Patent 3601698.
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The top panel is attached by two harmonica connectors: one for the power switch and one for everything else
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The amber lamp flashes when the instrument is on but no device is inserted
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Two green lamp illuminate when a good NPN is inserted
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Open circuit voltage applied to the diode test fixture
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Hy-tronix 900