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In Reply to: RE: Fan or no fan... posted by genungo on December 21, 2014 at 14:13:57
I'm not really concerned with the amp itself. The fault protection would prevent most situations. The actual shelf is what I'm concerned with.
Curious if the long term heat does anything to the shelf?
On the other hand, gear taking up even more space is why I have stayed with an integrated.
I really wanted to go pre/monoblocs, but giving up more space killed the idea.
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The upper shelf may eventually warp due to heat, especially if you weaken the structure by drilling ventilation holes in it. More importantly, the upper shelf could eventually ignite - with or without an amp malfunction.
Also, even if the amp's protection circuit was 100% trustworthy, it would not prevent a fire caused by overheating of the shelf material.
My inner paranoia is leaving it on the floor for now.
The really cheap but sounds okay tuner gets promoted to shelf.
I'd much rather have a Marantz 10B there, unfortunately no time soon.
When I had my Rogue integrated in a rack with restricted air circulation, I mounted a quiet speed controlled muffin fan on the shelf (using L brackets from Home Depot) and behind the amp. I turned the speed down so as not to hear it but sufficient to circulate the air. This kept the shelf above from baking.
With the large transformer covers on your amp, placing the fan behind it might not help that much. Another possibility is to get a regular box fan and run it at slow speed with air going across the tubes (L to R or R to L). Larger fans can turn at slower speeds (quieter) while moving more air. If the slowest speed on the box fan is still to fast, you can try a fan speed control.
First and foremost, do what makes you comfortable with the situation.
Now that I see your rack and with it being completely open on all fours sides, I personally think its all about nothing and your amp would live happily on the shelf.
But, better safe than sorry.
Dean.
reelsmith's axiom: Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.
Yup, better safe than sorry.
Back when I used to own an Audible Illusions tube preamp, one of the manufacturer's recommendations was that there should be a minimum of 12" of free space above the unit, just in case the unit should malfunction and catch fire. AA tube preamps have a good reliability record but they do run hotter than some others do. I'm sure that it never got nearly as hot as the tube amp in question here, though.
It's just common sense. If anything should go wrong, you don't want your insurance company doing an investigation afterwards and declaring that you were negligent and at fault somehow.
Your "inner paranoia" might be the best friend you'll ever have. Hot running amps require space, plain and simple. It's just the nature of the beast.If I was using a tube amp, the only way I'd rely on a fan for safety in a tight space would be if all surrounding structures were made of non-combustible materials. Class D amps are the ones to use for tight spaces.
Edits: 12/21/14 12/21/14
The ca[s also tend to blow up. It is a mess. I would suggest a larger gap between amp and shelf. Those amps on the shelf with the fans look like a fire hazard if you leave the room and God help you if you accidentally leave them on.
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