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The Tektronix CT-3 (017-061, 017-0061-00) is a magnetically coupled signal pickoff for sampling systems with a risetime of ~0.4 ns. Bandwidth is 50 kHz - 875 MHz (-3 dB) at no DC current.

It uses GR-874 connectors for the signal, and a BNC connector for the trigger signal at 10% of the signal amplitude.