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Germanium transistors: Difference between revisions
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Many Tektronix scopes from the 1960's contain | Many Tektronix scopes from the 1960's contain '''Germanium transistors''', e.g., [[OC170]], [[OC171]]. | ||
These transistors are prone to failure. | These transistors are prone to failure. | ||
In most cases, they can be replaced with modern general-purpose | In most cases, they can be replaced with modern general-purpose | ||
silicon bipolar transistors with no modification to the circuit. | silicon bipolar transistors with no modification to the circuit. | ||
Reasonable silicon replacements for small-signal NPN and PNP | Reasonable silicon replacements for small-signal NPN and PNP | ||
germanium transistors are 2N3904 and 2N3906, respectively. | germanium transistors are 2N3904 and 2N3906, respectively. | ||
When transistors appear in pairs in the original circuit | When transistors appear in pairs in the original circuit | ||
(differential amplifier, Schmitt trigger) change the pair, not just one transistor. | (differential amplifier, Schmitt trigger) change the pair, not just one transistor. | ||