Sansui AU-666: Parts List
I have assembled a parts list for this amplifier. My restoration does not touch original transistors as I consider them irreplaceable for an authentic Sansui sound. Thus I am only interested in exchanging the electrolytic capacitors. So this is what you will find listed below.
The schematic value corresponds to what normally can be found in the electrical schematics. The recommended value is what I replaced the former part with. The BP inscription signifies a bipolar capacitor. Where I found appropriate, I have chosen a film capacitor replacement instead of an electrolytic. My reasons are reliability in time. Less electrolytic capacitors, less time-ticking bombs.
Descriptions and Parts Listings
There are some Power Supply electrolytic capacitors mounted directly on the steel Chassis. These are either filter or decoupling capacitors. Normally I don't recommend replacing the big filter capacitors. Should they test OK, leave them alone. Otherwise, get replacements. But the smaller ones need to go.
|C002||3300 uF / 50 V|
|C003||3300 uF / 50 V|
|C905||1 uF / 50 V||1 uF / 50 V FILM|
|C906||1 uF / 50 V||1 uF / 50 V FILM|
|C907||2.2 uF / 50 V||2.2 uF / 63 V|
|C908||2.2 uF / 50 V||2.2 uF / 63 V|
|C909||1 uF / 50 V||1 uF / 50 V FILM|
|C910||1 uF / 50 V||1 uF / 50 V FILM|
There are two Driver Block boards in this amplifier. They are coded as F-1159A. These boards are positioned in front of the big black power transistor aluminum radiator. They are socketed in blue sockets mounted on the chassis. In the table below, I have listed the electrolytic capacitors for only one board. So be careful to double order each part. Thankfully, on this board, the engineers have spared electrolytic capacitors in favor of Mylar film ones. I cannot but greet them! Thank you, Sansui!
|C807||47 uF / 10 V BP||47 uF / 16 V BP|
|C809||100 uF / 10 V||100 uF / 16 V|
The Minus Ripple Filter Block board is mounted under the steel chassis, near the big filter capacitors. It is coded as F-1277A. Easy to spot, even easier to operate changes.
|C814||100 uF / 50 V||100 uF / 63 V|
|C816||4.7 uF / 50 V||4.7 uF / 63 V|
The Plus Ripple Filter Block board is mounted under the steel chassis, left of the Minus Ripple Filter Block board. It is coded as F-1231A. Easy to spot, even easier to operate changes.
|C813||100 uF / 50 V||100 uF / 63 V|
|C815||4.7 uF / 50 V||4.7 uF / 63 V|
The Tone Control Block board is coded F-1279 and is mounted upside down in front-left of the amplifier chassis. It is held in place by the potentiometer axles. In order to remove it, you need to undo the potentiometer axle nuts. I recommend to get it out in order to gain better access to it.
|C705||10 uF / 10 V||10 uF / 16 V|
|C706||10 uF / 10 V||10 uF / 16 V|
|C707||47 uF / 6.3 V||47 uF / 16 V|
|C708||47 uF / 6.3 V||47 uF / 16 V|
|C709||10 uF / 25 V||10 uF / 50 V|
|C710||10 uF / 25 V||10 uF / 50 V|
|C721||47 uF / 6.3 V||47 uF / 16 V|
|C722||47 uF / 6.3 V||47 uF / 16 V|
|C723||10 uF / 25 V||10 uF / 50 V|
|C724||10 uF / 25 V||10 uF / 50 V|
|C725||1 uF / 50 V||1 uF / 50 V FILM|
|C726||1 uF / 50 V||1 uF / 50 V FILM|
The Speaker Protector Block board is coded as F-1234 and is mounted under the steel chassis, just above the two blue sockets for the Driver Block boards. If we take the blue sockets as a reference point, then the Speaker Protector Block is diametrically opposing the Minus and Plus Ripple Filter Block boards. Easy to spot, even easier to operate changes.
|C903||220 uF / 10 V BP||220 uF / 16 V BP|
The Ripple Filter Block board is coded as F-1268A and is mounted below the mains transformer, in the left region on the steel chassis. This board does not require removal in order to exchange parts. The solder side is accessed from below.
|C012||100 uF / 50 V||100 uF / 63 V|
|C013||220 uF / 50 V||220 uF / 63 V|
|C014||100 uF / 50 V||100 uF / 63 V|
The Head Amplifier Block board is coded as F-1284-1 and is socketed in the far front-right region of the steel chassis. You cannot miss it.
|C605||47 uF / 6.3 V||47 uF / 16 V|
|C606||47 uF / 6.3 V||47 uF / 16 V|
|C607||100 uF / 6.3 V||100 uF / 16 V|
|C608||100 uF / 6.3 V||100 uF / 16 V|
|C611||10 uF / 25 V||10 uF / 50 V|
|C612||10 uF / 25 V||10 uF / 50 V|
|C621||33 uF / 16 V||33 uF / 25 V|
|C623||33 uF / 6.3 V||33 uF / 16 V|
|C624||33 uF / 6.3 V||33 uF / 16 V|
A lot of capacitors, indeed. But no need to worry. Take one board at a time. Success is guaranteed.
As always, let me throw a piece of advice. Do not hurry, take your time and do the job once. And do it well.