From the head amplifier to the equalizer amplifier and the buffer amplifier, the PE-505 employs a fully symmetrical circuit design at all stages, which amplifies, equalizes, and cleans even extremely weak audio signals. Even asymmetric signals at the conventional RCA input are converted into differential processing mode directly after the input terminals.

The equalization circuit at the differential output absorbs errors at the symmetrical output and delivers a more accurate audio signal. The equalizer reproduces the signals cleanly and naturally. A developed low-frequency equalizer amplifier achieves a RIAA deviation of less than ±0.05 dB (20 Hz to 20 kHz).

The PE-505 reaches 106 dB at the RCA input (MM) and 86 dB at the XLR input (MC), while the residual noise voltage achieves demanding levels of 10 µV at MM and 85 µV at MC (XLR input). In addition to the modern RIAA curve, individual curves for monaural records from Decca and Columbia are also supported.

The PE-505 features a switchable load capacitance for MM cartridges and a switchable load resistance for MC cartridges. Furthermore, the load resistance measurement allows the user to select an appropriate load resistance by pressing the MEASURE button on the front panel to display the total load resistance value, including the cable resistance, on the meter. The subsonic function displays subsonic signals below 6 Hz on the meter, while the subsonic filter (17 Hz, -24 dB/octave) cuts out unnecessary low frequencies from the audible range.