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Originally Posted by kc8adu
a friend down the road has a similar looking unit packed away from a move.
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These monitors were exported into the U.S. in the 1960's and 1970's. The engineer told me that he was with it on an exhibition in the General electric laboratories, to introduce the monitor. The American engineers were impressed. But after he returned to Germany, he got a message, that this monitor could not sold in the U.S.. The x-ray emission was exorbitant high.
The Germans had no experience with the shunt regulator and the x-ray shielding. They had to insert a piece of sheet metal around the PD500 to lower the x-ray emission. Some of the shunt regulator tubes got so hot that the glass melted.
In the television factory, they had a large hall where they tested the color picture tubes. More than thousand tubes were tested at the same time for shorts inside the tubes. They were driven with 30,000 volts continuously for four weeks, provided by a simple test-chassis with shunt regulator. After the test the tubes were installed into the tv sets. Some of the engineers, which worked with the picture tubes died because of high x-rays in these days.