Except for the Centurion, which is very quiet, also is "instant on" with
3-500ZG's- why buy another amp? :-)
73, Duane AC5AA
On Sat, 09 Sep 2000 19:12:48 +0000 alsopb <alsopb@gloryroad.net> writes:
> It seems that TenTec has cooling fan problems in most of their amps.
>
> The Titan 425 also had a noisy "fan". The cabinet seemed to be a
> sounding
> board.
>
> I don't understand why cooling can't be quiet. My furnace fan makes
> less noise
> and cools a heck of a lot bigger volume. It's just a matter of
> engineering.
>
> Sold Titan partially because of the fan noise.
>
> 73 de Brian/K3KO
>
> Duane A Calvin wrote:
> >
> > Hi Jim,
> > The fan noise is why I traded my Centaur in on a Centurion
> amp. The
> > Centaur does an excellent job, otherwise. (and the Centurion
> looks so
> > pretty next to the VI+!)
> > I did not perform the surgery on mine, but I can tell what
> my
> > "alternate" plan was. You will find if you remove the case that
> the fan
> > makes very little noise. But hold anything in front of the fan
> input
> > (use a Mouser backscratcher !) and you will hear the beginnings of
> the
> > noise. According to an acoustic/thermal engineer at my place of
> > employment who looked at it, TT simply mounted the fan too close
> to an
> > obstruction (cabinet side) such that there is turbulence generated
> at the
> > leading edge of the fan blades, and that is where the noise is
> generated.
> > This engineer recommended starting with punching round holes in
> the side
> > of the case in the fan intake area. If that didn't provide enough
> noise
> > abatement, he recommended removing all the case material at the
> fan
> > intake (and I would add, cover it with one of the kits available
> in
> > Newark to filter the air and keep fingers and other large objects
> from
> > finding their way into the fan or the case.) This was not a
> tested fix,
> > but this guy has a lot of experience on cooling fan noise
> problems, and,
> > as I mentioned, removing the case will almost totally eliminate
> the
> >
Duane A. Calvin, AC5AA
Austin, Texas
ac5aa@juno.com -or- ac5aa@earthlink.net
Day: dacalvin@us.ibm.com
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