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Sansui AU-D5

Integrated Stereo Amplifier

Sansui AU-D5


Power output: 65 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.02%

Damping factor: 200

Input sensitivity: 0.25mV (MC), 2.5mV (MM), 200mV (line)

Signal to noise ratio: 67dB (MC), 86dB (MM), 110dB (line)

Channel separation: 55dB (MM), 90dB (line)

Output: 200mV (line)

Speaker load impedance: 8Ω (minimum)

Dimensions: 430 x 148 x 328mm

Weight: 9.6kg

Finish: silver or black front panel


service manual (en) - AlkatrazBR

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Sansui amplifiers


re: AU-D5

Service manual specs are 33 mv along a double 0,3 resistor in onehousing s 50 mv biascurrent.
85 mv is to hot. This is what i am going to do: add a heatsink on the aluminium plate like his bigger brother au-s7. Then play with the bias current. The amp must placed otherwise then for better cooling.
Phono board is recapped only need a better coupling cap. (2 lytics in series) think of a motor starter cap 5,6 uf

re: AU-D5

karodimitrov's picture

I just download manual.There,in head 6-"ADJUSTMENTS"-is information.YES-you right.And for iC11 and iC12-2x10=5mF-its good idea from motor starter-they have better insulation capacity.

re: AU-D5

After succesful restoring an Akai Gx4000D reeltoreel deck will refurbisch this nice Sansui AU-D5 amp.

Any comments or tips?

re: AU-D5

Now i know why it became so hot... 85mv of bias voltage along a 0.33 ohm resistor. It should be 33mV...

re: AU-D5

karodimitrov's picture

Thing 15 mV.(0,015/0.33=45 mA...normaly).100 mA is too much(0.033/0.33).Sometimes when bias is bigger,amp sounds better,but it is when you listen him at low sound level-2x8...10 wats.Factory given bias is for full power.Rarely listen to an amp at full power.Try him at 100-if not hot....OK.I don,t look at the schematic and if factory bias is 100-OK.But if you make it 120 or 150-sound will become softer and deeper(signal level is near to the bias level).Try different options but be not far from 50...to 150 mA


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