Problem with Sansui Amp AU-101

[DrumDoc]

I picked up a beauty. A Sansui AU-101 for $20 at a garage sale.

Cosmetically a little paint damage to the cab and some laminate chip on one of the sides. Fixed that up.

Opened it up and it was clean as a whistle. Hit it with a little De-oxit anyways.

Hooked up a pair of speakers to it and I get an awful distortion on the left channel at higher volumes.

Any suggestions?

Thanks,

DD

 

[LBPete]

That's not a very common model so there won't be much of a repair history to draw from. It will take some diagnosis to figure it out. First place to start is with a good visual inspection. Does anything look amiss? Does the distortion change if you poke and prod a little?

- Pete

 

[DrumDoc]

It comes and it goes when i turn the volume up.

Not much power but sounds really clean until you turn the volume up.
I hear distortion on the left channel only.

 

[DrumDoc]

It comes and it goes when i turn the volume up.

Not much power but sounds really clean until you turn the volume up.
I hear distortion on the left channel only.

 

[Stene]

It comes and it goes when i turn the volume up.

Not much power but sounds really clean until you turn the volume up.
I hear distortion on the left channel only.

AU-101 is using Quick Acting Fuses (1.5A). Check if the fuse is ok and you have voltage for the driver board F-1302 on both sides of the fuse

 

[mysticmanda]

not being funny, but if it is not the fuse, then to my way of thinking, it seems likely that one of the output transistors has gone on the left channel, the symptoms that you are talking about indicate this, to sum up, no problem until you try to turn the volume up, then it distorts on the left channel, likely fault, shorted output transistor, hope this helps.:sigh:

 

[wolf66]

Maybe try it with headphones to see if this makes a difference ?
Is is a very good sounding amp and I think very underrated....