Audio Research SP-9 MK III Hybrid Tube Preamp with a great phono stage.
This is the last version of the SP-9 from Audio Research; truly High Definition Audio.
Upon release of the Mark III version, Audio Research said:
The technical improvements are numerous for the MK III, and include the liberal use of M.I.T. capacitors in critical input and output locations; additional filter and bypass capacitors for the power supply; a new input circuit board that reduces point-to-point wiring and improves overall grounding; new gold-sleeved tube sockets for better corrosion resistance and lower noise; new 6922 dual triode tubes; and improved high voltage regulation. Included 6922's are Sovtek.