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Sansui AU-D5

Integrated Stereo Amplifier

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Sansui AU-D5

Specifications

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

Downloads

service manual  English - AlkatrazBR

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Comments

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

karodimitrov's picture

re: AU-D5

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.
Luck...techtube!

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...

karodimitrov's picture

re: AU-D5

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
Regards.

re: AU-D5

Have some 6,8uf caps mkt for phono stage instead of dual lytics.
Extra heatsinks are on.
Question; a 1000uf 6,3v lytic is in phono stage to decouple a resistor to switch between mc and mm cart. Is this big lytic in signal path? Cannot figure this out. Exchanged it to panasonic fc 1500uf 6,3v thanks. :D

karodimitrov's picture

re: AU-D5

I found him.This circuit reduces the gain of signals with very low frequency(usualu 6-8 Hz).Thing...1000 is good.Changing the value of the capacitor you change the RC filter characteristics (RIAA correction).

re: AU-D5

Aha thanks! high pass filter/ rumble filter. With 1500 uf it will get lower in frequency and dangerous for the woofer. Then ill have to find a 1000uf cap.
Will also create L profiles with handles on sidepanels for the sansui amp. And blue led conversion instead of lamps in vu meter backlicht and source select lights.

karodimitrov's picture

re: AU-D5

In LUXMAN R-117 this filter is:C309-100mF,R317-210 Ohm.Hm...

karodimitrov's picture

re: AU-D5

In most similar schemes with field-effect transistors(one of which I did years ago this filter is:R-120...220
Ohm,
C-47...100mF.And still working, albeit with Russian field-effect transistors КП-302В.)Think-try a sample with a smaller cap.470mF...220mF.High Fidelity is a law,but the subjective opinion is more important.This is now your decision.For led lights-in my AKAI i did exactly the same,but I put green LEDs.The only problem is that the LEDs light focused (not as lamps) and had processed them with fine sandpaper to leave no bright spots indicators

re: AU-D5

Recapped it all and added blue leds. 1 lamp was broken.

Time to test it. Enlarged bias with the added heatsinks it should still be safe.

http://www.imgur.com/CPFBQyc.jpeg

karodimitrov's picture

re: AU-D5

Remains to tell me what is the final result...:)

re: AU-D5

Just tested it on phono mc benz micro cart and it sounds great ! The little coloration on voices is gone. Still some slight trace of hiss in treble but overall a very decent sound. With no music the amp sounds quiter the lytic conversion is succesfull on this amp. Should replace the main caps too if i can find them 9000uf 63v. Thanks for help.

karodimitrov's picture

re: AU-D5

...:)Sorry.I have 2x 68000 Mf to 63 volts.No need from them.How?
From this type...
http://tpetrov.com/search.php?prod=%D0%9A%D0%BE%D0%BD%D0%B4%D0%B5%D0%BD%...

re: AU-D5

Yes those snap in caps. I will order some panasonic 10000uf 63 v caps with free shipping on ebay. :)

karodimitrov's picture

re: AU-D5

Luck and write me...
REGARDS!

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