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It should make a big difference, have you checked the cap (or caps) across it? You should see a fairly sharp tune range (again with a subjective statement).
The prob with temp input is there are so many variables, ambient temp, line voltage, horz out emmisions, and then there is the lack of consistent measurement (kinda hot, slightly warm, barely warm,hot, very hot) so it becomes very subjective.
I generally use a LED targeted IR gun, aim for the hottest spot (often the point near the output lead to the HV rectifier).
I don't think polling peeps is going to get much good info due to all of the above.
That being said I personally think that if you were going to use a tube type tv with an RCA style fly, then active cooling would be in order as most of my RCA and clones get too hot for me to leave them running for hours on end.
a small muffin fan that moves the air around the fly makes a HUGE difference.
consider that the FLYs can not be easy to get AND they are 50+ years old make me think this is a good idea. And NEVER leave on unattended. The down side to a fan is IF they were to catch fire you would have a blow torch on your hands.
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