On 06/03/2017 21:56, Gareth Magennis wrote:
This is a bit weird.
I have an audio power amplifier that uses what looks like strips of pink
silicone sheet between the output transistors and the heatsink.
But these strips have degenerated and are kind of squidgy, a bit like
when Speaker surrounds fall apart.
Not come across this before.
They have got so bad that an arc occurred through one strip, beneath one
of the transistors, which has burnt a small hole in the heatsink,
blowing the amp and the SMPS, which I repaired.
So what kind of material could this pad be made of? Surely silicone
wouldn't do this?
This is the amp, you wouldn't expect this kind of problem on something
like this.
http://www.dbaudio.com/en/systems/de...amplifier.html
Cheers,
Gareth.
How old, to get an idea of service life for this silicone junk?