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