SilverFox

What are the tubes in the v1 - v3 positions. If there are any other tubes besides the Reverb circuit, please let me know. I'm considering putting together a Pro 501 preamp and haven't found the tubes indicated on the web schematic I've gotten ahold of. I guess that's the other question- I've found this commonly available schematic for the 501. It seems to be the same one available on several good sites so I'm thinking it is legit. The long 3 tube version. Just saw the attach option, This one- Thanks for any assitance- Fox.