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[PeteF]

If you did particularly want it in the toolbox you could use that heat transfer paste they use on computer CPUs. You could then use the toolbox itself as a heat sink. That would work.

[Scalyback]

Not sure...

Rectifier was very hot and toolbox was too, thus the bit about throwing bacon and eggs in!

[Blown265]

Thanks gents
That's reassuring information from Paul Goff. The toolbox in this case is vented, but the Powerbox runs at 45 deg C on a 25deg C day (measured with an IR gun) , so I was keen to hear of operating comparisons between the two locations.
Thanks again .
Paul