From experience dont leave the sets in the instant-on position as I lost the green gun on my magnavox combo. I could shoot it with my B&K and as long as the set was actually operating the tube remained good but after it went idle with the tubes warm it began to sink eventually turning into a K+G1 short that couldnt be removed. Given the availability of older triad pix tubes I would lean on keeping the heater time down to just operating only besides a set running in "standby" is going to pull around 100 watts or slightly less and at 0.08 cents per kilowatt hour it starts to add up.

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