Audio Research SP-15
¥ 1,250,000 (around 1990)
Commentary
Control amplifier with separate structure.
The main body and power supply are designed separately.
Hybrid design. The SP-15 uses FET for most circuits, but the phono equalizer stage uses three twin triode 6DJ8 tubes to achieve high input resistance and high sound quality.
A large toroidal transformer is used for the power supply section.
Balance output is possible using the Canon terminal.