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I did a reasonable amount of servicing in the early 70's and getting the three electron guns to track and give good convergence was probably the cause of a lot of replacements. The "Mask" that the electron beams had to accurately shoot through, at the front of the tube was a big problem in those early days also.
The only products out that had any stability to them were Zeniths, with the big heavy power transformers and later in the 70's were the Sony Trinitron.
Broadcast monitors at that time had pix tubes costing $2000.
Fred
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