DIY ‘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
From the pages of MAKE:

Cracker Box Amplifier - MAKE: 09: Fringe, Page 104.
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Original post by Collin Cunningham