Conrad Johnson TEA2 Stock Tubes

Does anyone know what tubes are stock in the Conrad Johnson TEA2 phono preamp? I just bought this phono preamp new and was expecting to see three EH 12AX7 tubes but they look to be NOS tubes. They have no brand label except for ECC83 and flash at start up so they could be Mullards. I was going to replace the stock tubes with NOS tubes but that may not be necessary if the stock tubes are already Mullards.