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Old 18th February 2013, 05:29 AM   #11
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As for the o'scope, get something with at least 100 MHz. bandwidth. The good stuff does not come cheap. Even though the audio band is 20 Hz. to 20 KHz., square waves contain overtone energy extending, in theory, to (sic) infinity. Prof. Fourier and his theorem strike again. Lots of high order overtones are needed to get good "shoulders" on a square wave.

A 1 KHz. square wave must be "perfect", in a properly adjusted amp. The look of a 2 KHz. square wave needs to be very good too. Small ringing and/or overshoot errors are tolerable, when a 10 KHz. square wave is applied. The realities of O/P trafo limitations become visible. Adjust for the "best" look. The age old tale of practical compromise gets "trotted out".
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