Insert the "U" shaped plugs so that pins 1 and 3 are connected.
Goldorak and Piedpiper - The BAT P10SE has separate RCA and XLR inputs. When one is using the RCA inputs, all you have to do is connect pins 1 and 3 of each XLR input. The numbers are marked on the back of the XLR input. These "U" shaped pins are available from various others sources such as Acoustic Sounds or Music Direct, etc, as well.
Thanks to all for your answers. I know the P10 sounds better in balanced input option since a phono pickup is a inherently balanced device. Finally I decided to reterminate my phono lead (SME Din Van de Hul D501) with XLR plugs that I cannibalized from an old unused interconnect, everything works perfect now. But I like to have my components complete as deliverd by the manufacturer, so I can make my own shorting XLR plugs.
The B.A.T. VK-P10 is really a superb phono stage, it's the second time I own one, sold the first to try something else (Pass XONO) but I prefer tubes, so I am keeping this one.
I have laid my hands on 2 new/NOS matched/balanced pairs on 60's grey plate Siemens CCa, so I have a special set for great occasions. I am also ordering a brand new set from B.A.T. I am wondering if changing the the 6SN7 can make a difference? As far as the 6S45, I think there is only one source for that tube, but some say it could be substituted for Western Electric 437A.
Thanks again for all the info.