[Diabolical Artificer]

Thanks chaps, on reflection my idea was rubbish,the schematic was just a rough back of a fag packet styley with no R/C's etc. Temp control would better as pointed out, I did pull a simple two tranny + NTC off a ATX PSU, but that circuit looks better Mark. However as the amp gets bl**dy hot after about 30 mins, this means the fan will be on full whack pretty much all the time, hence original idea.

I think I'm going to have to live with the fan, which to be honest you can't hear with music on as I mostly play rock, I wonder what it would be like with classical? Will give it a whirl.

Thanks for the ideas/FB etc, Andy.