The PH3 Special Edition is identical in circuit design to the standard PH3 phono preamplifier, with the exception that more than 100 different parts upgrades have been made to the SE version, including costly Infinicaps in both audio circuits and power supply regulators, high-performance soft-recovery rectifiers, Holco resistors in key locations, gold tube sockets, proprietary Audio Research damping rings, extended chassis damping, and more. The sonic improvements are significant in every respect, yielding better soundstage focus, more musical bloom and richness, greater dynamic expression and more impact and control at the frequency extremes.