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