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Below: There is at least 5 inches above the amp.Below: No cover installed.
I have a Sherwood S-5000 with five 12AX7's, two 7199's, four 7189 output tubes, and GZ34 rectifier. That a lot of glowing glass in a small footprint.It sits on a large rack with plenty of breathing room, but after a 5 hour session today the power transformer was pretty damn hot. The output transformers were only warm. All the tubes test very good to new, and I do not use it with the factory case/shroud installed.
I talked with Mike Samra today and he said maybe I should look into some sort of fan. Do any of you fellas have any recommendations for a QUIET fan? I am sensitive to fan noise and had a Hafler DH-500 once that sounded great.....until the fan went from level one to level two - Sold it.
I was thinking of a two pronged affair that I could plug directly into the back of the Sherwood. I was looking at this one, but don't know.
Thanks.
Addendum: I should probably add that I was running 87ish db Paradigm Reference 40 v3 speakers today while I upgrade the crossover caps on my horns. While I didn't have to turn the volume all the way up, I did have to go past 2 o'clock. My horns spring to life at around the 10:30 to 11:00 mark.
Meat; It's the right thing to do. Romans 14:2
Edits: 10/17/16 10/17/16Follow Ups:
Surprised that the Power Transformer heat is an issue.
Likely it's Dying. Test it, then Replace it.
IF you want to try a fan.. most ALL computer fans are Fabrique en Chine :-)
Also fans need to blow onto whatever needs cooling. Not suck from
A thermometer will validate that in a minute.
Blowing INTO a device encourages HOT SPOTS with no airflow. Air pockets are BAD.
Air must have an entrance and an exit. Pull-Thru is a very good way to ensure this.
YEARS ago, with my Carver Cube, I fabricated a fan which clipped on to the BACK of the amp. I removed the cover plate over the output devices and pulled air THRU. I used the fan ONLY when I redlined the amp for long time periods into my MG-1 panels which pretty much used ALL the power the amp could deliver. But it NEVER ran warm, either, when the fan was running. Though it was, indeed, a loud fan, you couldn't hear it over the Music!
I might have it around here someplace. I even put sound deadener in the enclosure but I'm not sure if that really helped.
Too much is never enough
NOCTUA owns the market. And INNOVATES. Now selling 5v fans.
But I'd say to go with the 12v and run it at 9v.
Too much is never enough
Thought I would share this. In addition to PC related cooling, there's an entire section on useful cabinet hardware and cooling.
I have used a fan similar to this one in the link below. Don't forget the cord as well, link below.
I just attached a 110 volt plug, plugged it in to an outlet on the back of my amp, and lived happily ever after.
Running a 230 volt fan at 115 volts makes it run half speed and much quieter. Ball bearing fans are also quieter in the long run.
The idea to use it to pull hot air up and out of the amp sounds better than pushing air down into the amp.
http://www.allelectronics.com/item/cfc-14/3-cooling-fan-cord/1.html
I have no connection with the vendor except being a satisfied customer in the past.
RT Barr
This one works for me. I use a pair on my Aronov monoblocs.
They have a pretty big line of fans aimed at the computer market. Most are 12VDC, so you have to make up a wall wart to power them. I use 3 of their "Truequiet" fans for my tube amps and preamp, and on low speed they are very close to silent. (In an exceptionally quiet apartment with the refrigerator in another room turned off and the fan on low, I can just hear it with my ear about 4-5 inches away, but no farther.) They also have systems that incorporate fans with liquid cooling for CPUs, which could be great for hot transistors in amps.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
No Contest.
And NO to Ebay, chinese stuff, too.
Only ONE quietest / best fan.
NOCTUA. You've got some reading to do.
Just one thing, I'd be reluctant to blow INTO a piece of gear. sucking OUT is much better and won't (probably) create any dead air which is the worst of all.
Too much is never enough
At one time there was a very quiet fan intended for audio applications called a Whisper Fan, actual brand name. As I recall it was about 4" square.
Googling that I don't see anything current but similar examples can be found with "whisper fan electronics". See link for example.
"The piano ain't got no wrong notes." Thelonious Monk
I use a Vornado Flippi fan placed behind my Latino ST 70. You'll need about 5" of shelf behind the Sherwood to pull it off. Fairly quiet on the lower speed which keeps the power tranny warm instead of hot. The higher speed would be better, but it's too noisy. So all in all, not perfect, but not a bad place to start for a $20-$25 investment.
Try a slow revolving BIG fan under the unit. Pushing the air up to the ceiling. Like a floor fan.
This seems to work better, when I record guitar amps. Versus smaller box fans, turning at high speeds.
Just a thought.
Sherwood is sure in nice shape. If you end up not liking the sound of a fan, heatsink would also help. Any kind of fins, better black, thermal grease where it touches the transformer which can be wiped off. As you mentioned you are running it with case off, should be running quite a bit cooler than most.
I'm using a new 5" AC-to-DC muffin fan.
Very thin and quiet.
It was pretty inexpensive too on flea-bay.
**Make sure whatever fan you get has ball bearings, or they will get noisy and wear out much quicker.**Steve
Edits: 10/17/16
Larger lower rpm fans are generally quieter and more efficient than smaller high speed fans. The larger blades move more air. That being said, you probably don't need to move a lot of air to reduce the heat buildup above your Sherwood. Just having the air circulate some will help immensely.
Checkout Amazon.com and search on "small box fan", "muffin fan", and "portable box fan", etc.
Muffin fans are often used in AV cabinets for air circulation but you'll want one that doesn't spin very fast or has a speed control.
You'll see some battery or USB powered small fans, some with AC power adapter.
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