"N_Cook" wrote in message
...
A friend of a friend asked me about some mixer-amp, make unknown.
It works fine but every now and they see a blue flash through vent holes.
Presumably before the reservoir caps and a break at mains volts, but what?
A green flash from a seriously overloaded fuse rupturing, but that would
be
one-off, but what could give a blue flash ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/






Most likely a dry jointed/fractured leg on an Inrush current thermistor or
dry joint on the mains fuse holder. Why don't you have a look, should be
easy to spot. This will be quicker than spending days pondering the
problem.



Gareth.