Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pbman1953 on December 11, 2016, 07:34:40 am
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This fan is an under chassis mount, unlike the YBA-3A Super which is a end cap side hole.
The existing fan has a 2 hole mount .
Thanks for any suggestions.
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People that didn't know those amps can't help you if you don't add a pair of photo
Ciao
Franco
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Muffin fans come in several shapes and sizes. Also Voltage! And AC or DC.
Measure and list what you do know.
Traynor certainly didn't have a custom fan made up. With shape and numbers you should be able to narrow down a fan from one of the big electronic distributors.
BUT: AC power fans usually fail from oil gum-up. Take it out, peel back labels and rubber plugs. Work thin oil (even ATF fluid) in, spin by hand or with a bit of wire in a power drill. When free, follow up with a somewhat heavier oil for long life. Motor oil in the SAE 10 or 30 range is fine for AC fans. (DC fans tend to like a thinner lube.)
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here's a picture
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Muffin fans come in several shapes and sizes. Also Voltage! And AC or DC.
Measure and list what you do know.
Traynor certainly didn't have a custom fan made up. With shape and numbers you should be able to narrow down a fan from one of the big electronic distributors.
BUT: AC power fans usually fail from oil gum-up. Take it out, peel back labels and rubber plugs. Work thin oil (even ATF fluid) in, spin by hand or with a bit of wire in a power drill. When free, follow up with a somewhat heavier oil for long life. Motor oil in the SAE 10 or 30 range is fine for AC fans. (DC fans tend to like a thinner lube.)
It's not that it's not working, it's noisy and it would be nice to have a quieter one.
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You don't specify measures
is this too big ? (120mm x 120mm @ 115V)
http://www.ebay.com/itm/120mm-38mm-Cooling-Muffin-Fan-Cord-Guard-115-V-AC-110-CFM-2-Pin-Ball-Bearing-4-/271249898617 (http://www.ebay.com/itm/120mm-38mm-Cooling-Muffin-Fan-Cord-Guard-115-V-AC-110-CFM-2-Pin-Ball-Bearing-4-/271249898617)
(http://i.ebayimg.com/images/g/sjUAAOxyldpR-Qua/s-l1600.jpg)
If you search you can find also cheaper
Franco
p.s.: Search only for Ball Bearing Fan
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> here's a picture
Oh! An appliance fan!
I rarely see those offered retail. I know the duct-booster I installed has that type fan inside, easily removable. I can't find the receipt but similar to the SunCourt:
http://www.hvacquick.com/products/residential/airflow-boosting/inline-air-booster-fans (http://www.hvacquick.com/products/residential/airflow-boosting/inline-air-booster-fans)
http://www.hvacquick.com/products/residential/AirFlow-Boosting/Inline-Air-Booster-Fans/Suncourt-Duct-Booster-Fans-Thermostat (http://www.hvacquick.com/products/residential/AirFlow-Boosting/Inline-Air-Booster-Fans/Suncourt-Duct-Booster-Fans-Thermostat)
Also at Home Depot. (Odd they have it listed as a Grow Room Ventilator?)
http://www.homedepot.com/p/Inductor-6-in-In-Line-Duct-Fan-DB206/100067594 (http://www.homedepot.com/p/Inductor-6-in-In-Line-Duct-Fan-DB206/100067594)
As a duct booster:
http://www.homedepot.com/p/Suncourt-6-in-Duct-Fan-with-More-Powerful-Motor-DB6GTP/202797339 (http://www.homedepot.com/p/Suncourt-6-in-Duct-Fan-with-More-Powerful-Motor-DB6GTP/202797339)
http://www.homedepot.com/p/Suncourt-Inductor-4-in-Corded-In-Line-Duct-Fan-DB204C/206584727 (http://www.homedepot.com/p/Suncourt-Inductor-4-in-Corded-In-Line-Duct-Fan-DB204C/206584727)
> it's noisy
Clean the dust-clumps off the blades. Oil the bearings. However a fan DOES make noise. Essentially in proportion to the air it moves and its diameter. You can run the same fan slower, but you get less cooling. Where we usually go for music gear is an oversize fan run slow for sufficient cooling at low noise.
"Muffin" fans with mounting venturi are often more optimized flow/noise. The venturi helps break the tip-noise. They are often rated for sound level. Again, figure the biggest space you can spare, then probably go down to the lowest flow (and sound) in that size.
Fan speed (and flow and noise) can be reduced with a resistor. Figure the fan Voltage and Current. That Gro-Fan seems to be 120V 0.6A. 120V/0.6A is 200 Ohms 72 Watts. Pick a resistor half that Ohms and same Watts, 100 Ohm 50-100W(!). Put in series, fan will run near half speed, blow, roar. (I suspect a 6-inch grow fan intended to clear an attic of pot-smell is much too large for a Traynor, but same math for a 120V 0.1A fan.)
While expensive, multiple small fans may fit a space better. Also a bit of redundancy. If you end up very over-blown, put them in pairs in series (60V to each 120V fan). They get very quiet! Flow is way down. However I had a net-router that must have been designed for a full rack in a black hut in the desert. Roared like a jet. Put fans in series, it cooled OK in my office, even when the A/C was out.
Remember that hot gear burns-up twice as fast for every 10 degrees hotter it runs. So in a sense your fan investment is compensated by longer life in PT and other hot-run parts.
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Oddly enough I placed a few drops of Marvel penetrating oil on the fan shaft and voila, noise gone!! The oil ran right into the body and quiet as a whisper.
Thanks for all your help!!
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> Oddly enough I placed a few drops of Marvel penetrating oil
OK, you had "squeal".
A happy fan "hisses" or "roars" just due to how it works. Fan size/speed versus airflow need controls that. A 75,000 Watt (100HP) car engine gets a 21" fan, opposed to the 4" fan a 100W amp might use. Cooling an engine with a 4" fan would indeed roar like a jet (tip and wind speed near the speed of sound).
"Squeal", "rumble", "rattle" are bearing problems. Unless you have run 10,000 hours that way and worn-out the shaft, the bearing will be "fixed" if the bad old lubricant and dirt is washed out and replaced with good juice. I have done that to my 1967 tractor and my 1991 truck. Now the 1996 minivan fan is begging for oil. (Turn up the radio!)
Penetrating oil is good for washing. Long term it will evaporate with residual gum. I would follow-up with either 3-in-1 sewing-machine oil or a light motor oil. Motor oil is excellent because it lasts many-many hours when HOT, so will last years when hardly warm. If you carry the fan to your car, one drop off your dip-stick is plenty of oil for your fan.
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Thanks , Home Depot would probably have that. But man, it's so quiet. I cleaned the blades too.