Good evening, I like to introduce myself with one of my Steampunk projects.
The player is based on RasPi and the DAC is a HifiBerry.
The VU - meters are based on “magic eye technology” and are powered by 12V. The anode voltage of 230V is produced
by a converter direct on the PCB. This is the reason why the tubes have there own power supply.
The amplifier is a class - D type and the box below the tube are the housing for the wide range speakers.
See it in action:
https://www.youtube.com/watch?feature=player_embedded&v=Xs525CHCAYg
You can find the whole instructable here:
http://www.instructables.com/id/A-Steampunk-high-quality-MPR-3-Player/
Have fun,
Horatius