Lexicon RV-8 query followup-fan noise?

Have a look at this web site.

http://www.newegg.com/Fans-PC-Cooling/Category/ID-11

There has to be something that will fit where your old fan is. If you're willing to run a small cable outside your Lexicon, you can control and power the fan externally.

I looked at some pictures of your RV-8 on the web and it appears to have vents on the top and sides. Another solution may to be install an external PC fan over the vents, if you don't want to go internal for whatever reason. Either way should work fine.

Yep i was thinking similar....there are some very quiet 80mm 12v fans, so i could just put an inline 24v-12v regulator in, and fit one of these. I see most of them have a third cable (to a resistor?) which i assume is the control? i looked at external pc fan controllers, but these seem to need their own power source? i guess i could run another 12v circuit in parallel from the inlune regulator, but this seems a mission. Anyone know of an external fan controller which works passively? Or is there an easier way to do this that im missing?

Ok i think i got this. According to my research, a 12v fan's speed is dependant on input voltage....So i can buy an ultra quiet 12v fan, then just use 24v-12v regulator from the normal power supply's (24v) power and ground feeds (leaving the fan speed sensor cable disconnected at both ends), and then just a small variable resistor, rated for the power requirements of the circuit, to step down from 12v to 5v, and back up again, depending on how much air i need to actually move to keep the power supply cool? Any advice appreciated here as im no electrician....

Ok. Lexicon state that (curiously) the original spec RV8 did not have a power supply fan at all(!), but confirmed that it is normal that, once the power supply fan WAS added to subsequent models, it stayed on permanently, with no internal speed control. So, if i removed the fan entirely, i would have an original spec RV8!! Albeit with a failure-prone power supply. The only thing i can think is that it was added as a hasty and poorly designed afterthought, to deal with the numerous power supply failures that lexicon had to deal with (including my own, despite it having a fan previously!). These power supply units really seem to be the weak part of the RV8 design, despite costing so much...I'm going to make the fan speed control and 12v fan modification, as well as a soft start circuit for the power supply, and take my chances....who would have thought such an expensive and well reviewed piece of kit needed so much work?!!