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That's strange. "Instant on" pretty much went away by the mid '70's. By the time this Samsung was made, most TV's relied on a secondary winding from the flyback transformer to provide filament voltage, as well as other voltages for the set. The only way for the flyback to produce any output would be for both the power supply and horizontal oscillator/driver circuits to be powered on. It's possible that someone installed a seperate filament transformer for the CRT and didn't wire the primary winding past the switch. If that's the case, it wouldn't be a problem to wire the filament transformer after the switch so that it will be switched on and off with the TV.
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