Burned Power Supply PCB's in Pioneers SX Series (727-828-939-980-1050-1080-1250-1280-1980) let's make things better ??

[tiefbassuebertr]

In the attachment there are some images from PS-PCB's of Pioneer's vintage receivers from the 70'. Main reason therefore is the fact, that no chassis mounting for the TO220 parts was realized - instead this only mounting on a actually too small heat sink.
All images in the web after performed refurbishing procedures show the same result - this means that thermal stress continues to occur during operation. This I don't like.
With the SX-939 I plan to screw the TO220 parts onto the chassis in order to achieve better cooling properties.
Maybe there are user's that have done this in such a kind and can upload images - thank you very much.

 

[Osvaldo de Banfield]

I always believe that this brand is only pure marketing.

Some times Engineers insist over their errors and as usualy they can't test their creations for long times, they never see them in real world. I saw it many times repairing industrial electronic goods.