2901
The Tektronix 2901 is a time mark generator. 2901 is fully solid state and provides 5 Sec to 2nSec marker, which 50nSec (20Mc) to 2nSec (500Mc) is only sine wave.#
Common problem by 2901 is labeling of key, labeling withstands not much activity.
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Front of 2901
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open, top
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open, bottom