> The first production runs used a different brand of mini jacks which
> had some problems with reliability. According to list lore the
> problems can be alleviated by gently pushing somewhere on the socket
> with a small screwdriver - this procedure is described somewhere on
> the Doepfer website, IIRC.

Only modules manufactured before ~ 2002 may be affected by this problem as
the material used for the spring contact was a bit too flimsy and not curled
(the new socket used from ~ 2002 have so called "curly contacts"). By the
way modules from all manufacturers that used the 3.5 mm Cliff sockets have
been affected by this problem, not only A-100 modules (as sometimes stated).
On our FAQ page you find some instructions how to solve the problem.

Best wishes
Dieter Doepfer