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It is dependent on horizontal and high voltage design. What materials they used in the flyback case, the insulation type on the 2nd anode wire, the hv rectification diode(s), and ultor voltage level. Sometimes, the focus block can emit the highest whine of the whole system. In my experience, some G.E.s from the 70s were the loudest; at least one I owned had secondary harmonic content along with the usual 15.7kc tone.
As for quieting them down, I suppose you could try tightening the bolts on the TO-3 cased horiz output, reflowing all solder joints under the fly, and maybe even applying some voltage-suitable silicone agent around the hv section. At your own risk.
Me, I am not bothered by the sound.
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