Ok so your saying to just let it cook with no image showing or anything??
I've never done this and I wanna do this properly so help me out here with the fine details just a bit. Please.

So let me know witch of these two mothods is correct....
#1
Hook up an 8 volt source.
then just let it "cook"
Or
#2
Turn the unit on with the heater supply changed to 8 volts. And see if the image warms up?
If I do #2 I'm pretty sure all 3 heaters are hooked up in paralel to the voltage source.
So if I disconnect one heater. And leave the other 2 running. Will there voltage go up because of the drop of current, or is there a voltage regulator most likely?
Thanks for helping me out
Rudy