[Electronic M]

There was no minute before power on standby setting for instant on sets. Most of them never powered off the heater, instead supplying half voltage the entire time the set was off. Some of the higher end consoles had a vacation switch on the back to turn off instant on.

Instant on is really only beneficial if a set is going to be on 8 hours a day and get turned off and on a LOT in that time.

Most color sets that had a thermistor and early Dumonts (that had a RC time delay feeding a relay) had the cushioning in the B+ circuit only and whacked the heaters with direct on-off-on action.