Colin,

It should not get that hot that fast.
Do you have the fan installed the right way around?  Is the fan 
running?  Is the bias for the power module correct? - your DMM may read 
0.02 volts or 0.020 volts depending on the number of digits it displays.

73,
Don W3FPR

On 1/7/2011 6:25 PM, Colin VE3MSC wrote:
> I've built up all 3 XVs, and find the 432 the hottest of the bunch.
> What are you doing to manage the heat ?  My output power drops and
> the case hits over 60C / 140F if I run for a minute at about
> 10W.  (Attenuator not a factor as driving at low level).
> VE3MSC Colin
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