Finite elemente are a German company that adopts a similar design philosophy to Stillpoints but they use ceramic bearings instead of metal. Here's a quick overview of their approach - http://www.finite-elemente.de/en/accessories/cerafamily/cera_technologie
They make the Cera One, which are 4 small component feet based on the design principles described in the link above. This company currently retail them at £89 for four, which is the cheapest online price that I've found. https://www.audiofreaks.co.uk/boutique/product/ceraone-20/
I don't know how effective the Cera One are but being flat they do offer stability advantages over cones.
quote name="ianmedium" url="/t/632518/analog-paper-2-discussion-and-appreciation-thread/1410#post_9667363"]Andy's suggestions are great and those are indeed the cheapest I have seen oak come feet.
I have been studying the thoughts on damping and isolation a great deal of late as in talking to some of my reviewer friends they think it is even more important with tubes.
All of them have said one company to me but they are expensive hence me trying to find other ways to achieve similar results. The company they all rave about is stillpoints.
The philosophy behind them is to drain electrical vibration in components out of the unit rather than damp it and the way this is done in their application is billets of metal with ball bearings in. These are two peices of metal separated my an elaborate bearing assembly. What this does is convert the electrical vibrations from the amp into heat which is then transferred out through the stillpoints to the surface they are resting on.
That is a fancy ( and very effective, I have heard this system) way of draining the vibrations away from the amp. I have found oak cones or metal or ceramic to do a very good job of something similar.
I still M trying to figure out how to make something akin to stillpoints myself and am close . I am trying to source some bearing races and then have a rod of metal sticking out of the center and a ring of metal on the base of the outer thus replicating in a way the stillpoints. Once I have the bearing assemble I can easily get brass stock from my local model shop for the center on which the amp will rest and then for the outer ring the brass olives I have will work perfectly.
But in the meantime the oak feet work well in draining the energy from the amp.
This newish philosophy goes against the traditional way of rubber feet isolation the amp. That way the amp is isolated from external vibration but all e internal vibration is contained within the amp.
What I have found with the draining method is that there is life and energy to the music rather than a dulling which I found with cork or rubber.[/quote]