Tubes for ST-70

I am brand new to tubes and my new to me ST-70. I just bought one but it's missing the two front center tubes. I have searched but can't seem to find out what specifically goes in there. What tubes should I use and where would I get them? Does anyone have a diagram of an ST-70 with a layout of the types of tubes necessary for proper functioning? I've come across many posts discussing different tubes (which is great when I'm ready to play). Right now, I'm just trying to get it to work. Thank you.

Check the stickies. Lots of information. Check the internet. Lots of information.

If it's an original Dynaco ST70 the two small tubes are 7199 and you will have to check with tube dealers or get them off eBay.
I believe you can buy adaptors so you can use an easier to find (and cheaper) tube in those two sockets.

Since it looks like you still have the original bias pots I would be almost certain that you need (2) 7199 tubes or (2) 6GH8A tubes with adapters. I changed out my driver board to the VTA board that uses more common 12AU7's when I built my kit from 1970 in 2020. I still have the never used Dynaco 7199's from the kit since I switched to the VTA board while assembling it.

You should look into upgrading the driver board as arremondo did.

If you decide to go with the 6GH8 and adapter route, I recommend the Amperex line of 6GH8's. I've tried the RCA's, Internationals, several Japanese brands, and maybe 6 others that I can't remember. Nothing sounds better than the NOS Amperex. There are 2 maybe 3 versions of the Amperex 6GH8: The French version, the British version, and kind of a Holland version (many times labeled a 6GH8 but really a 6BL8). The British ones are Mullard's and are the best. But any of the three will sound better than any other 6GH8 tube IMO.