@lewm
Given that you yourself often fail to read posts properly I do not understand why you would not be more mindful of the ramifications or consequences of your posts.
Actually you can run a 12AX7 with a 6V filament supply. In this case it would only require some re-wiring of the tube socket. But that’s the least of the reasons why not to do it.This post is irresponsible. If someone reads the first sentence, and omits to read the second, they could potantially damage their amplifier.
Given that you yourself often fail to read posts properly I do not understand why you would not be more mindful of the ramifications or consequences of your posts.