1970s ITC MEA-5100 Special Effects Amplifier

This is an ITC MEA-5100 special effects amplifer unit from the 1970s which was used to mix semi-professional video cameras of that era B&W and I guess colour as well. This is a real neat unit, it features picture fader sliders, wiper slider with 4 special wipe selections for fancy screen wipes, picture negative effect, pedestal adjustment, and camera switchers to switch between 4 different video cameras, excellent for video production work retro style!!!:D Anyhow I have fired this unit up, it powered up but is not working and I initially was hearing some crackling but it stopped. I haven't yet done any fault finding to this unit yet but will work on it sometime in the future. Here below are a couple of pictures of this great video mixer unit:
(Vintage Video Home)