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