Actually, I have had MUCH more success in isolating the transformer
mechanically from the chassis with the aforementioned Sorbathane.
https://www.sorbothane.com/Data/Sites/31/pdfs/product-guides/Sorbothane-SPG.pdf
<---- catalog of standard products.
I use isolation studs.... they have metal fasteners to attach to chassis
and interior components (transformer primarily), but there is a
mechanical decoupling via the Sorbothane material.
Alternatively, you could use a sheet of Sorbothane underneath the
xformer foorprint and a sheet between the xformer hold down clamp and
the xformer body. The principle is
1) Isolate the xformer from the metal chassis...
2) Include enough material mass at the right durometer to convert the
vibrations (and audible accompaniment) into heat, et al.
Used to use small isolation studs to mount the 10k RPM Barracuda drives
in 10-drive arrays in large CalPC steel towers.... Made them whisper
quiet AND protected the drives from shock as well.
73,
______________________
Clay Autery, KY5G
(318) 518-1389
On 04/24/20 15:07, Nate Bargmann wrote:
* On 2020 24 Apr 11:50 -0500, inventor61 . wrote:
If someone has a better idea than mine for making these, I am all ears.
No better idea. I've read in times past of someone sandwiching some
compressible material between the transformer and the supply top cover
to quell or reduce the hum. I have an RM-50M that hums in this manner
and fortunately it is not loud enough to keep me from listening to the
K3 at about 8 o'clock with external speakers.
73, Nate, N0NB
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