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The Tektronix Type 5T3 is a timing plug-in for the Type 661 sampling oscilloscope. It uses TD253B tunnel diodes for triggering.

It has a high-impedance external trigger input that is buffered by an 8056 Nuvistor cathode follower. The 5T3 also has a 50 Ω external trigger input with no buffering stage. This low-impedance trigger input is capable of operation up to 5 GHz.


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