Sansui AU-666 Integrated Amplifier Used (Serviced and Fully Operational)

This is a used Sansui AU-666 integrated amplifier. This unit has been serviced and is in full working order.

Regarding the exterior condition, there are no noticeable scratches on the front panel or knobs, but there are minor scratches, rust, etc., on other parts.
The wooden case has dents and chips (see photos 2-4), which have been repaired and lightly painted where possible.
Both the main and balance volume controls are free of crackling. Also, there is no popping noise when switching the rotary switches.
Sound output has been confirmed for all inputs except for the microphone input.

The following is a summary of the servicing performed:
◎ Replacement of electrolytic capacitors (see photos 9, 11-14, etc.)
Replaced on the pre-amplifier board, main board, phono equalizer board, and parts of the constant voltage board.
(Large capacity capacitors in the power supply unit remain original)
◎ Replacement of defective transistors (see photos 11, 12). Replacement parts are the same as the originals.
Phono equalizer board → 3 units
Tone control board → 3 units
◎ Replacement of semi-fixed resistors (see photo 9)
Main amplifier board → 4 units (within the circles)
◎ Disassembly and contact cleaning
Selector switch → 2 units
Rotary switch → 5 units (excluding high filter)
◎ Other (see photo 10)
Re-soldering of each board and subsequent flux removal (see photo 10)
Reapplication of thermal grease to power transistors (see photos 18-19)
The bias current for the power amplifier has been adjusted to approximately 10% lower than the manual's specified value.

This is a vintage item, but it has excellent sound quality and is popular. We recommend it to anyone interested.

#SANSUI AU666
#Sansui Amplifier AU666
#Integrated Amplifier AU666