This article discusses the role an output transformer plays in the tones produced by a guitar amplifier. The article touches on concepts explored by Leo Fender when he first released guitar amplifiers in the 1950s. Fender’s problem was that the power from a tube amplifier could easily overload a standard industrial speaker, as well as a high end speaker. By deliberately inhibiting the low frequencies from the amplifier, the speakers would not get overloaded. This had an unintended benefit of creating the distinct sound heard in many Fender amplifiers.
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Mark Baier—Understanding Your Output Transformer
