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As was mentioned by others they were a true p.o.s.Probably the worst thing Zenith put out.The belts would get out of time and jam.I had to turn over a few of them.They blanked out the picture if the screen wasn't all the way up.Had a few with the motor control boards damaged by lightning.Most I worked on I unplugged the motor.The customer didn't care to put the screen up and down.They just wanted it to work.They were air cooled tubes and used a 3 mirror system so the picure never was very good.Way more to keep clean than a regular projection and boy did dirt deteriorate the picture on these.They would get poor greyscale due to the resistors opening on the little pc board with the G2 controls on it.The convergence was primitive on these and was tough to get very good.They used custom CRTs with angle faceplates.The following model without the motor and different gel coupled tubes wasn't any better,Those tubes were short lived and often would get phosphor burns due to circuit failures,mainly open resistors on that little PC board.Those sets had huge deep cabinets.The first Zenith projections with really decent pictures were the digital series.They used normal liquid cooled tubes and convergence similar to other brands.But they were troublesome in their own ways.Mainly failures of the HV bleeder blocks would cause runaway HV and cut the necks of the tubes and had high failure rates of the HV board.
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