The Tektronix Type 67 was introduced in 1961. It is a time-base for 560-series scopes, providing calibrated sweep rates from 1 us/div to 5 s/div. It uses a 6DJ8 as the trigger input amplifier, followed by another 6DJ8 as a Schmitt trigger. The 67 was replaced by the 2B67 which is very similar to the 2B67, but has a single-sweep mode. The 67 does not have a single-sweep mode.