Pioneer SX-780 Output Transistors

[phillyflyer]

I have been listening to my sx-780 receiver when all of a sudden the output power transistors blew and now I need to replace them. My question is can only one blow and will it make both channels stop working? Or should I just replace both of them?

 

[redk9258]

SX-780 does not have power transistors. It uses STK modules which are no longer available unless you get inferior fakes. Here is a good read for you... http://audiokarma.org/forums/index.php?threads/stk-0050-replacement-for-sx-780-and-others.721181/

 

[phillyflyer]

Will do and thanks for the reply.

 

[Watthour]

Welcome Aboard!

If both channels are dead, start looking into the power supply regulator transistors. There are LOTS of threads regarding the weaknesses and resolutions to those problems, like this:

http://audiokarma.org/forums/index....-new-project-sx780.498294/page-2#post-6499565

 

[phillyflyer]

Another good piece of information. Will check that out too. Thanks.

 

[phillyflyer]

So I decided to go the default way and bought new STK's. When I opened the bottom of the receiver I noticed there was a newer STK module and what looked like the original STK module. I went ahead and replaced just the older one. Afterwards I tried powering the unit up to see if you hear that wonderful 'click' sound and I did. The receiver now performs as it should. So when one STK module goes it takes out both channels per say. I would recommend replacing one, try it and then replace the other if necessary.

Thanks again for the member input for this issue. I definetly gained some knowledge and experience through it.