Factory nulls for the Dynavector arms are
Inner 60.1mm Outer 116.5mm ( VE is wrong )
Dynavector state that their arm geometry is set for minimum lateral tracking angle error at the inner groove. Tracking angle error for Dynavectors using standard Dynavector alignment is 0degree at inner band of record and +2.2degrees at outside.
They do not specify which record they use as a reference so inner band could mean anything.
Lewm - Fyi my 501 has the DV7A arm base which allows for metal arm boards - the DV7A uses a single through hole collet and bolt under the arm board. This base provides a much more rigid coupling to the arm board than the the traditional screw in arm base used in the 505 that only has a top plate and screws. I suspect this was also a factor in the designer of the Final Audio VTT1 rejecting the 505 in favour of the 501.