To measure the Leben, I used Stereophile's loaner Audio Precision SYS2722 system (see www.ap.com and the January 2008 "As We See It").
The RS-30EQ phono preamplifier offered a voltage gain of 37.1dB, which is very much higher than the specified 23.5dB but is appropriate for moving-magnet cartridges. The preamp preserved absolute polarity (ie, was non-inverting), and its input impedance was 46k ohms at 1kHz, this dropping slightly, to 41k ohms, at the frequency extremes. The low-frequency output impedance was ridiculously high, at 28k ohms at 20Hz, and was…