$20 for 5 used tubes shipped CONUS; Ruby's are fairly new. I have these tubes gathering dust in a drawer after spending a little time with each in my Tube Works BlueTube 903. They all sounded good, and the Mullard sounded great, but these aren't the ones I finally decided on. I figure someone could make better use of these than filling up a drawer. They are: ECC81 Mullard 12AX7WA Sovtek 0512 Ruby 12AX7AC7 HG+ Ruby 12AX7ACZ HG Generic 12AX7 China The Ruby's and Chinese are pretty new, the Sovtek and Mullard's show a lot more use. These are really good for someone just trying out different tubes / gain structure, as I was. They all worked in the BlueTube, but haven't been tested. This is also my first venture into tubes so that's about all I can tell you about them. Looking to let them go cheap to someone that can use them. If you have any questions about the specifics of any of the tubes let me know.