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 The Orion II does seem to run warm.  Considering that the MTBF of electronics 
decreases by a factor of 2 for approximately every 10C degree rise, adding a 
fan seemed like a decent thing to do.
I removed the internal speaker and installed a muffin fan without modifying 
anything.  Typically these fans run quite loud so I installed a resistor in 
series to drop the voltage and the speed.  It's barely noticeable however the 
drop in temperature is very noticeable.
Mike, WA1SEO
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