Something I have done for years is to put memory foam under all the
amps I've had. A 1" piece will absorb an incredible amount of fan
noise. Granted it does not meet the fang sway <G> approach to an
impeccible shack but it alone will help just about every amp become
The 425 is so light without the transformer that it rests higher on
the foam than any other amp I've used in a long time.
I really dislike noise in the shack, my computer uses a water cooled
heatsink with a remote water pump and 50' of tubing. That keeps the
processor cool and the noise down to the sound of the hard drive
spinning. I have a music studio in the same room using the same
computer and it's far quieter than a laptop with fan.
> The fan in the 425 is a custom assembly that TT made out of standard
> parts, augmented with rubber grommets to insulate the vibration.
> After years of use they get hard and lose their insulating ability.
> The grommets are pretty standard, and I recall finding the sizes I
> needed in a Radio Shack assortment pack when I replaced mine about two
> years ago. TT no longer has replacement fan assemblies.
> There is also a piece of foam insulation strip (the kind with the
> sticky stuff on the back that comes in a roll at most hardware stores)
> that goes between the squirrel cage output manifold and the opening it
> fits into in the box with the tube sockets. It acts as both sound
> insulation and a gasket to keep air from leaking out. If this has
> moved or has deteriorated, it could cause the rattling noise. Also, a
> bad motor bushing could cause that, too.
> IIRC I needed to remove the filament wires from the back connector to
> remove the fan to be worked on. Also, getting the new foam insulation
> strip back into place was a real magic trick in itself!
> Ron N6IE
> ----- Original Message -----
> From: <firstname.lastname@example.org>
> To: <email@example.com>
> Sent: Monday, December 24, 2007 3:52 AM
> Subject: [TenTec] how to quiet fan noise on 425 amp
> > Are there any proven approaches to quieting down the fan noise on
> > the TT 425 Titan amp? Slow speed is tolerable (but not great), but
> > High speed just causes lots of "rattling" noise.
> > Thanks...
> > de Doug KR2Q
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