Just curious. I have a couple coming and was told that they sounded better in my amp than the ones I had in there. Sure, it is personal taste kind of thing but for $8 each I thought it can't hurt to have them around.
I have some ARS preamp tubes and I like them. They came in a few of the amps I bought used. No idea who actually makes the tubes or how old they are. If they sound good, go for it...