Vibration control. Tube equipment. What's the best way to do it ?

Every platform will affect SQ in some way.  Springs, dampers, etc.  I. Perceive the minus K platforms to be the most neutral.

I heard about minus K, some put their turntables on those platforms. That's expensive solution, anyway.

Im not sure I can i.prove but im a fan of the isoacoustic pucks

Engineers with ears and nuclear submarine vibration damping and isolation expertise = HRS

I use a steel amp stand, with vibrapods on top of that with a granite slab and then springs on top of that, and finally the amp. Also my small tubes have tube dampeners (from the factory).

Best of all would be a custom Silent Running Audio vibration platform. I have one under my turntable. I made a very significant impact.