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RE: Damping chassis internally?

If you have the chance to look inside the chassis of a CAT SL-1 pre-amp you'll find that damping material is used on the entire chassis. I once tried to find out what the material was but was told it was proprietary.

I tried using EAR C-1002 ISODAMP sheet to line the Hammond steel chassis of a phono pre-amp in the same manner as the CAT but found no discernible effect.

Way back when the Hammond Classic 200 series Power Transformers had a reputation for vibrating I began using EAR SD-40 between these transformers and the top plate which tamed the vibrations. When the 300 series came along the vibration issue was gone but I continue to use the SD-40 under all the magnetics in my builds in the belief that vibrations not gross enough to be felt might still be present and it can't hurt ;-)

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