NAD 314 problem (fading channels)

[amptech]

Hello to all....as with most amplifiers that show signs of fading in and out once they've been on for a few hours before the fault show's up...I tend to reflow dry solder joints cracked tracks etc and clean scratchy sounding volume/controls... sometimes I've came across the mica sheet that's between the power transistors and heat sink to have small holes in it thus shorting out the devices...

 

[richardmoon]

problem occured again - time to change this rely

Problem reoccurs again on mine every 3-6 months. How difficult is it to replace this relay?

 

[JakeTheSnake]

I fixed my NAD 314 amplifier with this trick

Thanks to everyone that gave good advices.
I fixed my NAD 314 amplifier by opening the black relay close to the speaker output terminals.


I first tried to fix it with brown paper + electric fixing spray, but this didn't work. Then I just took sanding paper and gently scraped those two surfaces.


Now it's fixed.

 

[Mark Tillotson]

If the contact plating is worn out it will oxidize again but quicker. Abrasives aren't the way to fix contacts, that removes the plating and damages the smooth surface - burnishing will work best. The relay spring may have weakened with age too, exacerbating the contact issues.