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That's a funny circuit (compared to the typical horizontal oscillator-driver-output in most sets I've worked on), so I'm not sure why it seems to want feedback from the collector of the output. But definitely the 300% increase in the cap, would flatten the feedback pulse, and that would cause a stability problem if the circuit is looking to that feedback for some reason for syncing or stability. It's my guess, that it's something to do with the AGC keying, but still....
Go with the 1uF @ any voltage 12v or > .
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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