I've been looking around for a Variac and I've noticed that while all of them 
run around 0-140 volts they have widely differing amp ratings. How large of 
an amp rating do I need for TC use? I know that I could just look on my 
xformer and see that it draws 2.2 amps and use that as a guide but I plan to 
get an NST to replace my OBIT soon and I don't know how much current they 
pull. Will a 5 amp variac work or do I need to go with the larger 30 amp...or 
is there somewhere in between that would be more suitable to TC use?

Left, left, I hadda good brain but it left...