• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Any opinions on Cooling fans for Tube Amps?

pantoramasan

AK Subscriber
Subscriber
I want a very quiet fan for my tube amps. So far everything I tried does not offer the whisper quite I would like. Anyone have a link to good quality quiet fans?

Thanks!
 
Register to hide this ad
I've used 4-6" electronics cooling fans and run them at 1/2 voltage with good results. Something like a 12V fan run at 6V, slos down the fan and removes most of the noise. Mounted under my big amps in the past - still use this under my VT-100.
 
Unless I had some insane military jobber or crazy OTL, I'd forgo the fan and let the tubes run hot, that's why they put filaments in them. :)
 
What amp?

Reason I ask is, maybe you can let convection do the cooling for ya. I did a custom case here and added lots of vent holes in the top plate as well as an open grid bottom with taller legs.

assembly-iron.jpg


That allows the heat of the tubes to pull cool air in from the bottom and I get MUCH cooler tubes as a result of "chimney effect". Extra height on the transformer legs leaves a good gap around the base of those, and the wide spacing of the tubes out more than normal certainly helps.

tube-temps.jpg


Lot of work, but maybe you could retro the stock case you have for the additional venting anyway.

And ya, ANY fan can be a PITA to deal with depending on your musical preferences. And +1 on the tubes are meant to get hot thing. Mostly, I'd worry about the iron, but even then, if you can put a finger on a transformer and leave it there for several seconds without leaving a patch of skin behind, yer good.
 
Last edited:
WOW, Beautiful work!
here is my reason for cooling, at least until I find something new to put them on. BTW, I am running 4 Dynaco Mark III's and using my Marantz 4270 Quad as a pre amp for 4 channel and soon quadradial sound. It gets a little hot after a few hours.
 

Attachments

  • IMG_1420.jpg
    IMG_1420.jpg
    60 KB · Views: 131
  • IMG_1421.jpg
    IMG_1421.jpg
    48.8 KB · Views: 117
I would not have the hot amps below the vinyl player. In fact i would rather have the amps behind or close to the speakers.
Apart from that, a MkIII does not need any external fan, only some free space above.
 
Location, location, location!

I'm thinking air circulation could be improved immensely just by relocating the amps to the top shelf. Tubes like to "see the sky" as they say.

Problem is usually the rack itself having a hard time dealing with the extra weight way up top. Solution there is to add a reinforcing panel to the back of the bottom shelf to keep it from ... er ... racking sideways. All my tube stuff is up top ... also notice the damper legs underneath the amp raise it up higher to allow more air to flow for additional chimney effect.

home-again.jpg


My DIY cabinet has a full size plywood reinforcement panel behind the records, which is also handy for power distribution stuff ...

cabinet-detail-bottom.jpg


... and there are also plywood dividers supporting the next shelf up. Around 600 pounds on a whole bunch of teflon gliders and it gets moved a lot and has held up well over time.

In your setup, I'd think a full size hardwood panel replacing the two rear spindles on the bottom would do the trick nicely.
 
Last edited:
That's my immediate problem. Hopefully soon I can replace that shelving unit with something more appropriate and different placement of the amps. Right now I have a small amp cooling the bottom of that shelf, so it's not too bad, but I am looking for that whisper quite fan for the time being. Lot's of good suggestions from members. Thank to all...
 
My shelving unit is made of solid Mesquite. A very hard wood. I could try to move the amps to the top and next level down. That might work for now. Good suggestion...
 
OK then, but DO give some extra thought to maximizing air space around the amps. Most folk can get away without any fans as long as there's good air circulation.

Another thought. My old HTPC ran hot and also had "issues" with air circulation. The solution was a laptop cooler. Low speed, large fan, and very quiet.

syba-cooler.jpg


Maybe attach one spaced out from the bottom of the shelf above the amps. You'd need a USB port or a USB wall wart to power it up.

MS028031_600w_600h_sb.jpg
 
I use a super quiet ThermalTake 120mm USB fan on the power transformer only, at lowest setting.
Together with a InkBird digital temp controller ($17), I let the system cool the PT when needed. I stuck the probe on the chassis near the PT and calibrated it with a laser gun.
Works great and gives me piece of mind as I listen to my system for long hours.
 
Guitar players overdrive tubes for hours on end in unventilated pine enclosures. And the tubes keep on just fine!
 
Back
Top Bottom