The best upgrade you can buy for your system...
 

Jim Lesurf wrote:

Having this happen more than once is, as has already been pointed
out, an indicator of poor design or manufacture. This is the root of
the problem. Thus to avoid similar problems in future, choose hifi
components that are better designed and built. Then you can use the
power switch with more confidence. :-)

Yes... and when I replaced the PSU in the first unit I noticed that
whilst the rest of the unit was built to a reasonable standard, the PSU
was cheap and nasty. Indeed I was surprised that it hadn't failed
sooner... and was waiting for the day when I turned the second unit on
and it also went bang.

It's now happened, and I've replaced this PSU with a decent quality one.

--
Glenn Richards Tel: (01453) 845735
Squirrel Solutions http://www.squirrelsolutions.co.uk/

IT consultancy, hardware and software support, broadband installation

The best upgrade you can buy for your system...
 

** Only a BADLY worn or damaged lamp filament fails at switch on.



Er, excuse me. How does the filament of a bulb wear?


--
Woody

harrogate3 at ntlworld dot com

The best upgrade you can buy for your system...
 

On Tue, 22 Aug 2006 19:37:46 GMT, "harrogate3"
wrote:





** Only a BADLY worn or damaged lamp filament fails at switch on.



Er, excuse me. How does the filament of a bulb wear?

It evaporates and deposits itself onto the glass as a black coating.
The filament thus gets thinner with age.

With a quartz halogen bulb it doesn't deposit onto the quartz, hence
the longer life. What it does do though is deposit itself onto
different bits of the filament, so some bits get thin and eventually
break.

d

--
Pearce Consulting
http://www.pearce.uk.com

The best upgrade you can buy for your system...
 

On Tue, 22 Aug 2006 19:37:46 GMT, "harrogate3"
wrote:

** Only a BADLY worn or damaged lamp filament fails at switch on.



Er, excuse me. How does the filament of a bulb wear?

It boils away. Ends up as a black smudge on the inside of the glass.

The best upgrade you can buy for your system...
 

"harrogate3"

** Only a BADLY worn or damaged lamp filament fails at switch on.



Er, excuse me. How does the filament of a bulb wear?



** Metal continually evaporates from the surface of the hot tungsten wire
and re-deposits on nearby areas - but not evenly.

Near the end of the filament's life, the wire has a varying cross section
and hence varying resistance along its length.

The thinnest areas get hottest ( I squared R ) and melt, causing lamp
failure.



........ Phil