I was curious so I looked at the information on their website and it appears you will need to own an EMT turntable or have a power supply built to use this phono preamp. See the notes quoted from the link below.
https://www.jpvanvliet.nl/139stb.html
Note 1: The 139st b can only be used in earlier EMT 927 and EMT 930 turntables with serial no's before 14725 with the necessary power supplies for the EMT 139st and EMT 139st b.
Note 2: Turntables with serial no's higher than 14725 can be upgraded with the new 139st b power supply upgrade kit to fulfil the possibility of using the 139st b in young EMT 927's and EMT 930's.
https://www.jpvanvliet.nl/139stb.html
Note 1: The 139st b can only be used in earlier EMT 927 and EMT 930 turntables with serial no's before 14725 with the necessary power supplies for the EMT 139st and EMT 139st b.
Note 2: Turntables with serial no's higher than 14725 can be upgraded with the new 139st b power supply upgrade kit to fulfil the possibility of using the 139st b in young EMT 927's and EMT 930's.