Built a "luggable" boombox.

See ​http://ohm.bu.edu/~hazen/TubeAmp/#boombox

Used two 6T9 "compactron" tubes in Ultra-linear single-ended configuration, closely following this excellent design:

• ​http://diyaudioprojects.blogspot.com/2008/09/ultra-linear-6t9-diy-tube-amplifier.html

Other parts:

• Antek AS-05TC250 power transf for $35.00. 250-0-250, 6.3V, 5V 50VA total
  • ​http://edf.bu.edu/svn/edf/EricHome/TubeAmp/BoomBox/AnTek_AS-05TC250.png
• 12 pin tube sockets
• Pair of 6T9s
• FaitalPRO 3FE25 (​link) $20 each /
  • .12 ft3 = 207 in3 / port 1" dia x 3" long

See also:

• ​https://www.nutsvolts.com/magazine/article/the_stereo_6t9
• ​http://diyaudioprojects.com/Tubes/6T9-Tube-Amp-Kit/

Boxology-

• Speakers: 5.5w x 7d x 8.7h (outer) box of 1/2" plywood.
• One port 1" ID 3" long
• Two-layer chassis with two "floors" 6w x 8d x 9h.
• Speakers hook on side of chassis with carrying handle
• ​Drawing of proposed layout

Plywood cutting from 18" x 8' piece for speakers:

Other