Vintage James Millen Ham Radio Tube Oscilloscope 90903 For Parts or Repair. (USA) Model: 90903, S#1159 Vintage: 1958 Purpose: Monitor Oscilloscope Condition: Parts or Repair! Comments: This is a 19in rack mounted unit. The 90903 is very similar to the 90902. Main difference is that the 90903 has a 3KP1 CRT, while the 90902 has […]