The Sansui AU-11000 is part of what Sansui called the “Professional Series”. The Au-11000 has side connected inputs and outputs. There are outputs for 2 sets of speakers selectable by Off, A, B or A & B. There are 2 phono inputs with load and sensitivity adjustments. 2 tape connections for playing and dubbing. A Tuner input and 2 Aux. inputs. The AU-11000 has a 3 position volume attentuator. Sansui is famous for their quality transformer and the 11000 has a large toroidial transformer. The knobs are machined solid aluminum.
110 watts per channel.
A damping factor of 80 @ 8 ohm load.
The following restoration has been done to ensure the Sansui AU-11000’s reliability and doesn’t effect the intended “sound” of the amplifier. The Sansui sound is in the circuit design but the new components may improve the perceived sound quality. This is a sweet, smooth sounding amplifier that reveals all the detail.
The unit was completely disassembled and cleaned.
All the electrolytics on all boards have been replaced and all the boards have been cleaned and defluxed.
The bi-polar electrolytics in the preamp have been replaced with polypropolene film capacitors.
The 4, 10000uf power supply filter capacitors have been rebuilt using Chemi-Con KMH capacitors.
The motorola “Uni-Watt” pre-driver transistors have proven to be unreliable in this and other Sansui amps, especially at this age, so they have been replaced with OnSemi MJE350 and MJE340. A direct cross from OnSemi.
The 2 VD1212 diodes were replaced with modern substitutes.
The protection relay has been replaced with a new Omron relay.
The output transistors have been removed cleaned and replaced with new heat sink compound and are original.
All the controls have been cleaned and operate noise free.
Bias has been set after a 30 minute warm up with the covers in place and checked again after 60 minutes.
The spring type speaker terminals have been replaced with insulated binding posts that accept bare wire, spades and banana plugs. It is a tight area so large WBT type spades won’t fit.
The hard wired power cord has been replaced with an IEC jack so other power cords may be used. Since there was no ground connection on the original cord the ground was left unconnected.