Paper Tube Amp
From the MAKE Flickr photo pool

Smadin made use of an old liquor bottle tube as an amplifier enclosure for the Ruby circuit – BalvenAmp on Flickr

Related:
Coconut Amp Crop
Coconut amp

From the pages of MAKE:
Crackerboxamp09
Cracker Box Amplifier – MAKE: 09: Fringe, Page 104.