Balanced Audio Technology Preamp - Tube compatibility question - Help

Hello,

I have a BAT VK-3ix preamp and I just purchased some 1950's Sylvania 6v6GT tubes for it (presumably a power tubes of some sort).  I was going to install it and I noticed it had an extra pin in the number 1 pin location.  Pin number one I think.  According to Audiotubes.com the number 1 pin of gray glass tubes:

 NOTE ON THE METAL SHELL 6V6 TYPE: Pin 1 of the 6V6 family of tubes is usually not connected in the glass tubes, although some of the greyglass types may have the pin internally connected to the grey RF shield. The metal jacket 6V6 (no suffix) has PIN 1 CONNECTED TO THE METAL SHELL. This effectively turns pin 1 into a GROUND PIN. It is important to make sure there is no voltage or active circuit connection (other than ground) on the pin 1 connection for the 6V6 tube in your amp if you plan to use a metal shell 6V6 tube. IMPORTANT NOTE: You should ALWAYS check and/or adjust your amp output tube's bias settings when replacing 6V6 or ANY power output tube!

I bought my tubes from the Tubedepot.com and I even asked if they would work in my unit.  They said they would, but now I'm getting cold feet and don't want to blow up my gear! The ceramic input does have a connection in the pin so Im note sure.

I