Trigger Countdown Unit with manual Tektronix Type 280

Description

The Type 280 Trigger Countdown Unit is designed primarily for use with Tektronix sampling time-base systems. It can also be used with Tektronix Type 530, 540, 550, and 580 Series Oscilloscopes. The Type 280 will synchronize the trigger circuits in the sampling time-base units at frequencies up to 5GHz.
Unit is basically new with inspection tag attached. Unit is in very good physical condition, powers up but I am unable to test so sold--
AS IS
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