 None of the first generation of true broadcast cameras in the middle to late 1960s had ACT, so the EMI 2001 was not unusual.When observing old programmes, such as those from the 2001, it is very easy to tell if a programme used EMI 2001s (or any other first-generation PAL colour camera) to capture the images as the comet tails would often be coloured "blobs" or "splodges" (usually caused by a light source or light reflecting off a highly reflective or polished surface) simply because the camera did not have ACT circuits.Some broadcasters modified their cameras to have ACT, but retro fitting ACT/HOP was not an easy modification as 4 new HOP camera tubes would be needed, the tube bases, wiring harness, 4 head amplifiers and 4 video amplifiers and the tube beam current boards would all have needed work done to them.