Mesa 2:90 Fan Mod ??? - Jemsite
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post #1 of 3 (permalink) Old 12-02-2009, 03:42 PM Thread Starter
Join Date: May 2008
Location: Ireland / UK
Posts: 293
Mesa 2:90 Fan Mod ???

Hey guys

Is there any way that i could install an ON / OFF switch , to the fan in my mesa 2:90 ?

When im playing late at night , i have to keep the volume quite low (thanks to new neighbours!) and the fan is quite audible over the guitar sound.

Also , when micing up the cab , you can hear the fan sound being picked up by the mic.

Note there is nothing atall wrong with the fan , its not rattling or anything , and ive hoovered it all dust free.

I opened up the 290 to have a look , but it seems more complicated than just soldering in a switch !

Shredragrammaton is offline  
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post #2 of 3 (permalink) Old 12-02-2009, 03:51 PM
Join Date: Mar 2001
Location: Los Angeles, CA
Posts: 1,205
Reviews: 12
Re: Mesa 2:90 Fan Mod ???

i've thought about "upgrading" the stock fan by finding an AC fan of similar size [i'm sure *some* computer hardware stores carry 'em] and installing/soldering a voltage regulator or an on/off switch on the hot signal of the fan as opposed to installing a switch that's routed from the 2:90's board...
but i got stuck at being too lazy to open and study the innards of the poweramp :P

reguv760 is offline  
post #3 of 3 (permalink) Old 12-02-2009, 04:55 PM
Join Date: Jul 2008
Location: UK
Posts: 1,641
Re: Mesa 2:90 Fan Mod ???

I'd recommend getting the part number of the fan. Places like stock fans in just about every size and type you could want, and they'll generally have some quality ones to pick from (Panaflos and Yate Loons are pretty quiet, if they carry them in the right size.)

As for powering it, most fans of that type run on a 12v feed. Its pretty likely that the fan will say this directly on it, so check that, and while you're at it, check the fan power cable just to be sure theres no resistor in it thats reducing voltage fed from another source. If there is, make sure to, by hook or by crook, keep a resistor of the same value in the same place, even if you change the cable.

All in all not a complex job in most instances, but you're going to need to get into the amp at some point, unless you're willing to send it to a tech and get charged out the ass for it!

Oh, and when you open it, LEAVE IT UNPLUGGED (not turned off, UNPLUGGED) FOR A FEW DAYS BEFOREHAND. Power amplifiers carry and store HUGE amounts of power inside, and you can easily hurt yourself if its not left to discharge.
GuitarBizarre is offline  

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