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I THINK what people are refering to is what is known as the "200 volt cap". It is in the bias supply to the CRT cathodes. Nearly always--it is a flyback-derived supply--on solid state sets. Even BW sets have this cap--including the 1M30T20--it is called the 120 volt supply--and derived from the flyabck.
It will be from a 2.2 UF to a possible 33UF, Usually 250 volts or more--but some late 70's to 90's sets tied that cap to the B+ supply --so it only sees the increase from the flyback on it.
Occasionally--this cap is on the CRT board--but usually on the chassis, and often near the flyback.
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