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This may help or hurt. Been 50 yrs & if wrong please correct.
Burst amp pulls the color sync off the horz blanking pedistal. It on the " back porch " and 8 cycles. Hoz osc pulses gives it the narrow grab, the
burst tube amps it & passes it to the 3.58 for sync.
No burst gives barber pole color or no color. The burst adj can "center" the
tint range.
Dead 3.58 gives a classic pink & green on many sets (RCA), no color,
wrong colors, barber pole. Xtals do go bad but not often. If the
XTAL has a third GND wire use that type.
enuf
Zeno
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