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The CTC-20 was a low-end special. We sold a few, and they were dogs right out of the box. First run had weak vert sync, and the factory issued a field mod requiring changing two resistors in the sync separator circuit. The chassis was a mashup of the CTC-19 (designed for the new 19" rectangular tube), back-engineered to drive a 21" round tube. It's as if the factory was overstocked with round tubes and needed a quick way to use 'em up. And it was the perennial 6GH8 hog (as was the '19 and all its later derivitives).
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