Ive never worked on or around neon signs, but ive heard the same. Dont they operate off a really really high voltage?Call you local neon sign shop, they will know the answer.
Neon transformers can be lethal so you really need to know what you are doing.
In general though, neon transformers are sized by the total footage of the connected tubing.
If you know the diameter, length and color of the neon, tI need to know what size transformer to use on a store front sign....problem is there is nothing on the sign that tells what the VA' s are..can any one help?