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This Admiral has an on/off switch for the Instant-on.
IMO... Instant on gets a bad rap concerning picture tubes tho....
My Uncle was a repair tech, and who knows.. he could have been "full of it" but he always said instant on was BETTER for the CRT. He said the cold starts and power up was what shortened the life. If you go by this belief.. think about it a minute.... I've seen "specials" where someone talks about how a light bulb has been turned on for 50 years and is still going. It's the constant on/off that shortens the life. Then.. concerning computers... especially ones that are used in a work-place environment, there are some machines that never get turned off during their life cycle. Even some computer mags say it's better to leave them on 24/7, because it's the daily start up that will shorten component life. The only sets I've seen that had really bad CRTS are the ones that were fine when in use, but for some reason, got stored away, and much later.. u fire it up, and surprise.. dim CRT.
I have a Sony KV-17 series from 1975 that has instant on, and its CRT is fine. Most horizontal chassis Zenith Chromacolors were instant on, and rarely.. (I can think of 3 off-hand) have I ever seen a bad Chromacolor tube.
As for the slow power up.. I never bother with a set manufactured after 1967. It's not like early radios, or say a color set prior to the CTC-15 chassis. I'm not saying a cap could be out of tolerance and effect performance, but I think it's a waste of time on a later model set to start replacing caps, just for the worry that one will blow up......
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