This is a premium socket for mounting on PCB. I am now listing the Euro style hole/contact here. It is strictly user preference. pin c/c spacing (across the socket are 1″, pins are on 360/8 = 45 deg radial angles and ~3/8″ spacing absolute apart. The PC hole pattern uses what is standard for octal PCB. Consult your layout libraries. You can also find the footprint here: EL34 footprint & symbol by Bugera | SnapMagic Search (snapeda.com). EL34 will work for 6v6 and 6l6, but remember, EL34 does not have G3 connected to K internally like the other 2 do. These have the Euro (mouse hole) style contacts. For USA (slotted hole) contact style, see my other listing. ships from Texas USA I combine shipping across all items, most will be automatically combined if you add all to cart first. See my other auctions.