Modding a TV to use a thermistor for slow power on

[LukeSimon]

I heard that some people add a thermistor to their tube electronics so that when the power switch is turned on, the initial rush of current is dampened as the thermistor heats up. The idea is to prolong the life of the components in the TV, especially the heater filaments. Does anybody here have any experience with this?

I know that "instant on" tube TVs can accomplish a simplified version of this, by using an external power switch to determine when the "stand by" power is turned on to pre-warm the tube filaments for a minute. Then the TV's power switch is used to fully power on the TV. The thermistor mod sounds much more convenient though.