Positioning Components in Rack For Best Sound

8 components, 6 shelves... something has to double up! Two systems, a pure analog 2 channel and a 7.1 surround Home Theater system sharing space on a rack.

Question: If I only really care about the sound quality of my analog rig-- and the home theater components will not even be powered on while I'm listening to vinyl... does it matter how the components are positioned in the rack? Will it compromise the preamp's sound in any way?

Here is how the rack is currently populated, from top to bottom:

1. Turntable
2. Tube Headphone Amp and power supply (side by side, not stacked, runs hot)
3. AV Receiver (feeds front L&R channels to preamp which passes it along to Amp, disabling it's own attenuator).
4. Tube Preamp with BluRay player on top of it and Digital music/video server on top of BluRay
5. Power Center
6. SS Power Amp

Any recommendations for the rack?

Thanks!