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Pioneer SX-737 Receiver Trouble

Henry Jones

Henry Jones

New Member
Hello everybody,

I am very new to AudioKarma (about 30 minutes new) and I'm also new to this whole world of analog audio listening. I bought my first set up about a month ago now. It is as follows.

TT: Technics direct drive automatic turntable system SL-5
Receiver: Pioneer model SX-737
Speakers: DCM speakers; 2 timepiece and 2 TF 250's

The set up is great (by my amateur ears) and I absolutely love it. Recently though I've been having some issues and I think it has to do with the receiver. I have an attached video that will better demonstrate the issue. Any information helps!

https://www.facebook.com/video.php?v=10154566490530419

The only thing I've done so far is replace the ground wire, and that seemed to work for a few days but unfortunately I think it's a bigger issue...
 
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all i see is this .....
Video Unavailable
This video may no longer exist, or you don't have permission to view it.

p.s welcome to AK
 
My bad on the video! New to all this. I've made is public on facebook. Should be viewable there. Tried to upload on Youtube and couldn't figure it out (internet noob, sorry in advance).

@Bassblaster Yes. Scratching and popping.
 
ok ..first try moving all controls and switches a good few times then see if any different .
also try and determine if its just left or just right side .
 
Popping and starchy sounds like simple dirty controls. very simple to fix. all you have to do it pop the cover off.
EDIT: IT MAY BE LEAKY TRANSISTORS ON THE PHONO BOARD! VERY COMMON. that will requite some work. dont worry its not to hard to do.
 
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@petehall347 Do you mean to simply toggle everything? Like just hit a bunch of buttons? What does that do exactly? (not opposed to giving it a shot, simply curious)

@Bassblaster just pop off the top of the receiver? All of this is incredibly new to me. I really don't want to make anything worse. If it's simply dirty do I just get some dust off? Or is there a best way to clean it?

Thanks to both of you for your replies.
 
@Bassblaster Can you further explain to me leaky transistors? That seems like the most accurate diagnosis because problem occurs strictly on the Phono setting. Currently I'm blasting some music from my phone on the auxiliary setting and it's clear as day.
 
Henry Jones said:
@Bassblaster Can you further explain to me leaky transistors? That seems like the most accurate diagnosis because problem occurs strictly on the Phono setting. Currently I'm blasting some music from my phone on the auxiliary setting and it's clear as day.
Click to expand...
that 90% confirms leaky transistors on the phono board. most basic way to explain a leaky transistor is that its "leaking" current when they shouldnt be
 
i am just trying to see if the switches etc are corroded and need some cleaning .hopefully if this is the case it may change the noise after working the controls . to be sure they will need something like deoxit spraying inside the switches etc .
did you figure out if problem is both sides yet ?
 
@petehall347 I have some "Ideal: electronic switch and contact cleaner". Think that will do the trick? And if so how do I exactly spray 'inside the switches'? Does it require some deconstruction?
 
it is worth a shot of cleaner even it it doesn't fix it .. i however do agree it could well be the transistors at fault . probably 458 ones in there .. if i remember right ..
 
To everyone here. Just switched it over to phono setting after listening on aux setting. No popping or scratchiness at all! (Radiohead has never sounded better). A problem is most annoying when it teases you in absence. Don't know if this add's any variable to the things you guys have been saying.
 
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