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I have an L3 pre-amp. The case is used in many products, I have found a vibration problem. The case panels are like a drum and easily take on vibration which can be amplified due to board mounting pillars, then on to the boards and valves.tapping the case easily demonstrates the problem. I am thinking of using dampening pads but I have no experience of them. Any advice? Car parts stuff have bitumine panel deadeners, but how will this do with heat from valves?
NKS
Follow Ups:
In the end I did all I could with pads but the real cause turned out to be a valve going faulty. Swapped the valve for a non crio and all was well again.
NKS
I used the bitumen pads made for dampening cars with oversized boom-boom machines. Just don't cover the holes in the case. I also use silent blocks to mount transformers which makes quite a difference. You can also use silentblocks to mount the PCBs.
Hello, I use a lot of silicon for mounting capacitors and the various boards, and also around the transformers. Easy to work with but need to be careful not to block ventilation.
I haven't tried it on my L3, but I've used Black Hole Pad in the past to dampen the vibrations to an Audio Note CD player. I cut the 12" X 18" sheet into pieces about 1" X 9" and used two inside the top and one each on the two side panels. It seemed to be an improvement. I would suggest not covering the pre-amp cover completely with any damping material as I found in my experience it dulled the sonics too much.You can find an example of the Black Hole Pad at the link below. Easy to work with by cutting to the desired size with a utility knife and the adhesive is quite strong. I've also had good results using it to dampen vibrations to glass shelves on an equipment rack. The material might also be useful in building constrained layer shelves.
Edits: 12/13/12
Hi NKS
I would source some genuine bitumen panels for audio use. You don't want them to fall inside and catch fire, you you know bitumen is highly flammable!
You won't need all over coverage. Probably 1/3 width along the top and 2 long sides would be enough to stop the excitement of the metal sheet.
Have you kept the units away from the speakers as much as possible? Obviously the closer it is the more sound wave effects.
Good luck.
Thanks all for your advice. I will check some products out. Some are quite cheap, so no harm done
NKS
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