I am sorry for your ignorance and i am also be called you-tube, expert bulbs like teky will anwer you-tube.
Itz look like we are derailing from the main topic, please enjoy the tube pic for the day and have a nice nap.
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Now I am back on track with PVC pipes. I am now almost sure that the Bluman group also read Hifivision regularly:lol:. See, they got inspiration to make music out of tubes from our very own Swami69. Checkout his DIY thread:
http://www.hifivision.com/diy/8637-my-diy-easy-make-fostex-103e-fullrange-speaker.html