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Sansui X1

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pmoss

New Member
Sansui AU-X1

If you find the Sansui AU-X1 at the right price, grab it!
I found mine over ten years ago on eBay for about $800.
You'll be surprised by its sound!
It is still performing excellently.

My vintage sound system:

- Sansui AU-X1 (1)
- NTH SubTwo (1)
- NTH Super Zero (4)
- Sony XA3ES (1)
- Soundcraftsmen T100 (1)
 
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Are you referring to the AU-X1? Lovely amp, but very highly strung and known to oscillate itself to death without appropriate mods. One has to be very careful when buying them on the used market. Many no longer have the special output transistors as they were fried long ago.

Glad to hear that you're enjoying yours. It sounds as though it is operating nice and stable. :)
 
Yes, it is the Super Integrated Amplifier AU-X1.
Sorry for leaving out the "AU-".
I got mine in a like new conditon - not even a scratch.
I knew about the "oscillation" issue, but I just tried my luck!
After over 10 years, it 's still working well.
Maybe, I'm just lucky!
 
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I purchased a mint Sansui AU-X1 on Ebay last summer for £800 (instruction manual,schematics etc included).I've been using it every night since with no problems whatsoever (although it did get quite hot during the UK heatwave when it must've been over 100 degrees in my room).
I think the oscillation problems were only on the very early batches.
I have to pull the plug on mine to turn it off,as the switch is faulty (but it's a simple job to fix,and was described as such when I purchased it).
Only ever used mine via headphones with a Naim CD5,but boy-what amazing sound quality!
 
The excellent thing about the AU-X1 is that it was designed/built with the sole intention of providing the very best analogue sound quality (just like it's matching TU-X1 tuner),and it certainly succeeded!

No tone controls,flashy LED's,VU meters etc,just the stuff you really need... Quite surprising for an integrated amp that had a very high MRRP of $1,500.00 back in 1979!
 
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When introduced was the flagship of sansui's amps. Special design Special parts.
No compromises , engineers amp.
 
2 weeks ago i passed by a repair shop and saw in the corner a sansui au-x1. the tech who is used to repair china made amplifiers told me that the owner has not yet found the replacement parts. And I believe he could'nt find one because even I had a hard time looking for a non china made 100uf 25v capacitor for au-d707 in every shop here.

My question is should I buy it from the owner and try to fix it? I'm still hesitant as I heard bad stories on this amp once it dies.
 
eriksally said:
2 weeks ago i passed by a repair shop and saw in the corner a sansui au-x1. the tech who is used to repair china made amplifiers told me that the owner has not yet found the replacement parts.
Click to expand...

Finding the exact replacment parts for some items is almost impossible now - so suitable substitutes are what is needed.

eriksally said:
And I believe he could'nt find one because even I had a hard time looking for a non china made 100uf 25v capacitor for au-d707in every shop here..
Click to expand...

I don't understand?... why "non china made"?... and 100µF, 25V is a very common value and voltage available anywhere, in a whole slew of manufacturers electrolytic capacitor ranges.

eriksally said:
My question is should I buy it from the owner and try to fix it? I'm still hesitant as I heard bad stories on this amp once it dies.
Click to expand...

You would need to be a very confident and knowledgable tech to repair and recondition one of these. (a lot like me in many ways :D). My understanding is that the 'early ones' need lots of attention - the later ones not so much.

BTW: Welcome to AK, and a special welcome to the Exclusively Sansui Forum.:thmbsp:
 
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All electronic shops from where I live sells cheap china made capacitors. A tech friend gave me the 100uf 25v that he took from a dead amp since I would not risk my au-d707 with what is available from electronic shops.
 
eriksally said:
All electronic shops from where I live sells cheap china made capacitors. A tech friend gave me the 100uf 25v that he took from a dead amp since I would not risk my au-d707 with what is available from electronic shops.
Click to expand...

True. - high street shops in the main sell rubbish - you need to order from major distributors online like Mouser or Digikey.

A capacitor from a 'dead amp' would potentially be more risky to use than a new one of any kind. :scratch2:
 
Here is what I did to my 919. I replaced all electrolytics on the amp board (the one mounted to the heat sink) with panasonic FC caps from Digikey. And (of course) the black flags with silver mica caps from the same place. Some of the values in silver mica that they didn't have, I found at mouser.
The panasonic FC is a good sounding relyable cap and it comes in many values.
To make things simple for me, I did the amp board (boards in your case) first and lived with it for a while to be sure this part of the rebuild was done correctly.
Later, I did the pwr supply. I used the FC caps in that section as well.
If you order from either one of those two suppliers, you can have it sent by regular mail and it will save you a ton on shipping. This way you don't have to order a huge list of parts which makes things complicated.
We're here to help you through this!:yes:
Here is a good link for the X1...
http://www.youtube.com/watch?v=ko4nn1NFJp4
 
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My x1 stopped Some time ago and was sent to GoodOldHifi in germany. They did a good job ( i think) and also replaced all of the black flags and they had to refix some bad fixes/modifications from the past. Their filosofy is to not repair what is not broken. So no eletrolytics were replaced.
After some time the amp started to give hum on both channels, also driven by a separate pre amp directly to the power amp. I measured a large dc offset on both channels. The hum is noticeable through the music at low levels.
Can this hum be caused by faulty electrolytics?
 
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