Sansui Au-7700 parts list?

[CALLTHECOPS]

So this is my first rebuild/restoration. Can anyone who has rebuilt one of these help me out with a list of parts (caps, transistors, etc) that would be recommended to replace?

My main gripe right now is a quiet crispy sound in the left channel (that does not seem to increase with volume, so it really isn't that noticeable when listening at any sort of real volume) - but only after it's completely warmed on and been in use for several hours. I have a nice 2000a that I can use while this is getting the treatment - so I'm ready to dive in.

I'd appreciate any tips, things to look out for - and a parts list!

Thanks!

 

[CALLTHECOPS]

So this is my first rebuild/restoration. Can anyone who has rebuilt one of these help me out with a list of parts (caps, transistors, etc) that would be recommended to replace?

My main gripe right now is a quiet crispy sound in the left channel (that does not seem to increase with volume, so it really isn't that noticeable when listening at any sort of real volume) - but only after it's completely warmed on and been in use for several hours. I have a nice 2000a that I can use while this is getting the treatment - so I'm ready to dive in.

I'd appreciate any tips, things to look out for - and a parts list!

Thanks!

Alternatively... how can I test to find out where the crackling is coming from? the PO said he had replaced "some" of the caps a few years back, but it could probably use a recap eventually. Could a failing capacitor cause these sorts of symptoms?

Thanks!

 

[LBPete]

The first place to look for crackling noises is in the controls. Every knob, button or lever on the front panel has a switch or a pot behind it. Almost any one of them can cause this kind of noise if it is dirty or oxidized. Cleaning those controls may fix your problem.

- Pete

 

[CALLTHECOPS]

The first place to look for crackling noises is in the controls. Every knob, button or lever on the front panel has a switch or a pot behind it. Almost any one of them can cause this kind of noise if it is dirty or oxidized. Cleaning those controls may fix your problem.

- Pete

ah, I forgot to mention that I've already taken all covers and knobs off and deoxit'd everything. twice! and the crackling remains.. I've had lots of vintage gear over the years (home stereo and guitar gear), so I'm not 100% green, but I have never recapped an amplifier. thanks!

 

[LBPete]

Then try freeze spray. Hit each of the small signal transistors and see if the noise changes.

- Pete

 

[CALLTHECOPS]

right on, will do!

here's a (possibly stupid) question... how can I determine if the transistor that's making noise is in the preamp or the power amp? I know I can separate the two via the switch on the back.

 

[DEAFASABAT]

So this is my first rebuild/restoration. Can anyone who has rebuilt one of these help me out with a list of parts (caps, transistors, etc) that would be recommended to replace?

My main gripe right now is a quiet crispy sound in the left channel (that does not seem to increase with volume, so it really isn't that noticeable when listening at any sort of real volume) - but only after it's completely warmed on and been in use for several hours. I have a nice 2000a that I can use while this is getting the treatment - so I'm ready to dive in.

I'd appreciate any tips, things to look out for - and a parts list!

Thanks!

PM me if you want a service manual. Regards, -DAAB-