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I see "jailbars" toward the left side which mean the flyback, as a tuned tank circuit, may be out of tune and ringing in a non-linear mode.
What is the chassis or model number? the TelAid might have something on this.
It could be as simple as a bypass cap off the boost supply, or even a cap in the yoke, if used.
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"When resistors increase in value, they're worthless"
-Dave G
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