Resolved problem with Oscilloscope by replacing a Vacuum tube in the Sweep Gating Multi-Vibrator for Channel A. Note the thumbnail image is of Jacob "Jack" Kruschen who was a Canadian character actor was nominated for the Academy Award for Best Supporting Actor. In this 1959 movie Angry Red Planet "Jack" plays Chief Warrant Officer Sam Jacobs on a ship headed for mars. In the movie "frustratingly" tape was put over the Tektronix logo! (in spite of the fact the 545A was a key feature of this movie).
