How are tubes made?
Check out http://www.retrovox.com.au/amv137.html. (courtesy Doug Roccaforte) • What is the difference is between even and odd order harmonics as it relates to amps Harmonics are a by-product of distortion. Even when an amp sounds clean, there is generally some distortion present, and the nature of that distortion may produce predominately even, predominately odd, or similar amounts of both even and odd harmonic distortion. The terms “even” and “odd” are very basic. Harmonic distortion is produced in multiples of the fundamental frequency. If the multiple is even, (2, 4, 6, etc.,) the harmonic distortion is even order. Likewise, if the multiple is odd, (3, 5, 7, etc.,) the harmonic distortion is odd order. For example: Lets say you play an open “A”. The fundamental frequency is 110Hz. This is the open A string on a guitar. If your amp is producing predominately even order distortion, then the harmonics will be even multiples of 110Hz. The 2nd harmonic will be 110*2 or 220Hz, the 4th wil
