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The 155-0109-00 (M120B) is a Tek-made trigger chip good to 350 MHz in a 16-pin DIP. It was designed by Gary Vance.

It is designed to be used in conjunction with the 155-0126-00 (M121) trigger amplifier and channel switch.

There were two versions, the 155-0109-00 and 155-0109-01. (Differences?)

Used in