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I was reading that book, the low side of the brightness pot should be -14 the high side +12. Check the peaking coils right by the 12BY7, the -14 is pretty close to what you have the high side seems too high (+20v not +12).
this could be an open peaking coil or a weak 2nd video amp.
check L12 and R61. What value do you have for R64?
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