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155-0137-00 in P6451 probe

The Tektronix H493  (P/N 155-0137-00) is a pre-amp/comparator hybrid integrated circuit in a ceramic package.

Channel equivalent circuit (click to enlarge)

It contains five comparators with FET inputs and differential ECL outputs that can drive terminated 100 Ω twisted-pair lines. The instrument input would contain differential ECL receivers like the 10115 or 10216.

Used in