sorry, my English is not so well...
my terratec phono-preamp pc-interface asks me for the recommended range
of the input-capacity of the pre-amplifier.
I use a Shure M91ED.
it is possible to choose between 100pf, 250pf and 425pf.
the intention is to bring my vinyls to harddisk with wavelab from steinberg.
With your pre-amplifier, use a capacitive load of 425pF for each input channel.
For the M91ED, the recommended minimum load is 400pF per channel and the maximum recommended load is 500pF per channel.