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* ''[https://spectrum.ieee.org/consumer-electronics/audiovideo/the-cool-sound-of-tubes The Cool Sound of Tubes]'' by Eric Barbour, IEEE Spectrum, August 1998.
* [http://www.tubebooks.org/ Tubebooks.org]
* [http://www.geofex.com/tubeampfaq/taffram.htm Musical Instrument Tube Amp Building, Maintaining and Modifying FAQ]
[[Category:Vacuum tubes]]
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