What isolation feet under your amp with great result?

@t_ramey 
EL84's...Nice amp. I am looking for more detail and realism from my preamp. It's a choke point in my system, all other components have been successfully treated with footers and platforms.
The limiting factor with the pre is I only have room for 1" footers due to shelf space, so I'm going to give the EVP's a try. Many thanks.

Squeek_king, I see they make a short footer, but it's more than I want to spend. Thanks.

Before isolating the amplifier from the vibrations coming off the speakers... isolate the speakers vibrating, your source, your floor, your walls, your rack/stand holding all of your equipment.

Saying that, getting the energy into (springs for example) will require some planning, especially if your system is sitting on a substrate, being the materials under your floor, which may be somewhat absorbent already. Concrete is ideal as its rather unyielding compared to peer an beam, wooden floors. However mass loading under wood can drive a higher percentage of energy into an isolation system.

Townshend of UK and Solid Tech of Sweden are two good sources for products and information as to why I am suggesting the speaker isolation before electronics for return on investment.