Does anyone know if Peavey matches quads in their stock tubes for amps, or if they just use two sets of matched pairs? I swapped out some power tubes in my 5150 as a matter of tonal preference, and the tubes I put in are starting to run out of gas, but I forgot to keep track of how the original tubes (which still have plenty of life left in them) were paired, and it'll save me a bunch of money if it doesn't really matter.