yes, input resistance and capacitance are user definable. The circuit uses split-RIAA. The second stage has 30dB gain. The first is 29dB minus the RIAA EQ... .. so around 60dB.
Here's an excerpt from the service manual:
"The phono stage was tested on two different systems with a Grado
Sonata (47 Kohms load), a Kiseki Lapus Lazuli (100 ohms load),
and a Sumiko Celebration (1000 ohms load) cartridges all of which
have outputs in the range of 400 to 500 microvolts.
The circuit was quiet and had sufficient gain. A subjective
consensus has it that the phono stage offered precise imaging and
spatial placement and good depth. Compared with the Xono, the
Pass Labs reference, it was slightly noisier, and had less gain.
From a sonic standpoint, it acquitted itself well in comparison,
lacking only slightly in dynamics."