I adore my Ampeg Heritage SVT. However, there is one thing that I hate about it… and it’s not the fact that it weighs 100 lbs.
It’s the loud ass cooling fan!
Trivial to most… After all, even at low volume, you can’t hear a noisy cooling fan once an SVT is rocking, but the sctmmc is all about principals, and the flagship model of the bass amp, which is touted as the ruler of the low-end universe, shouldn’t have an embarrassing fan.
How loud are they? Exactly loud enough to draw the attention of everyone on stage during warm up. So look at it like a flat tire, yeah you can drive on it, but you’re fully aware that something is wrong, which if ignored, usually leads to more expensive repairs in the mechanical world.
I called Ampeg and I got a human on the phone! So I could’ve died happy, but I was a little taken back when the rep knew the part number off the top of his head. Plus, I’ve bought a few fans in my time, and $40 sounded three times too expensive.
Not that $40 to fix it was too expensive for the repair, but considering that this American made gem had already failed prematurely, replacing the broken part with the same crummy part didn’t make much sense. And, knowing what I know about manufacturing short-cuts, I just had to quest for a better way.
One of the most costly manufacturing differences in electric motor construction, is ball bearings vs. bushings. Whether its a vacuum cleaner, a jack hammer, or a cooling fan… It has an electric motor, and it either has bushings or ball bearings.
Ball bearings are precision manufactured from stainless steel in Switzerland or Germany, and bushings are made from crap by a guy who rents his shop from the Tuscan Raiders.
So what came in the Ampeg? Cheap bushings of course.
But when I searched for a replacement fan of suitable specs, I discovered a part number variation. Sunon, the OEM fan manufacturer had two fans with these specs… an HSL and an HBL. HSL “Sleeve”, and HBL “Bearing”.
So, now I still have the OEM fan, for less than half of what Ampeg would’ve charged me (for a fan that they should’ve just given me), and it’s upgraded with the BB’s, so it’ll last thousands of hours longer than the cheap bushing unit. Now this amp is finally on it’s way toward “earning” it’s reputation…
I will say that there are differences between the decibels of a bushing fan vs a bearing fan, and yes, the bearing are louder… However, the difference is inaudible, and far below standard recording studio noise requirements.
And finally, since the world is filled with butt suckers… this is my advice and my experience. If you don’t like it, I really don’t care. If you have questions, feel free to ask… and If my amp blows up because of this repair, then I’ll delete this story.
Have a nice day!