You can take at the more details description of the Japanese Soulnote D-2 DAC inner heart...
www.kcsr.co.jp
Non-feedback discrete amplifier
Ultra low jitter DDS TLMX2594
Quad ES9038PRO
Analog power supply capacitors
Coupling film capacitor
Discrete Regulator
400VA huge toroidal transformer with a directly mounted spike foot
Low jitter TCXO and high frequency relay