5T3
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-ohm external trigger input with no buffering stage. This low-impedance trigger input is capable of operation up to 5GHz.
Tektronix 5T3 manual: http://w140.com/kurt/tektronix_5t3.pdf
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front view
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left view
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right view
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top view
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bottom view
