TONE STACK: James

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The James tone stack is one of the more common bass/treble tone controls. You most often see it in hi-fi equipment, or in guitar amps that sit outside the usual Fender and Marshall mould – although both Fender and Marshall did use similar circuits on rare occasions. Probably the best-known guitar amp examples are Orange … Read more

MARSHALL: 1974X AKA the Marshall 18w one knob tone controls

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Another simple one knob tone control, this time from the Marshall 18w amplifier, or the model 1974x, whatever you prefer…    Marshall used two different tone controls in the amp.  A lot of folks build the 18w lite, which is just the normal channel of the amp, and they often use the trem channel tone … Read more

FENDER: One knob tone control

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This is the classic single-knob tone circuit made famous by a number of Fender amps—most notably the 5E3 Tweed Deluxe.  Despite not inventing it, Leo must have thought that he nailed it when he first dropped this into a guitar amplifier: it’s simple, clever, and very musical.  Despite using only a handful of parts, it … Read more

CTS Speakers

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Chicago Telephone Supply (CTS) originally built drivers for telephone network signaling and tone generation. By the late 1950s they expanded into loudspeakers, supplying the booming tube-amp market.  Their speakers, often marked with the EIA code “137,” were used extensively by Fender, Ampeg, and many other amplifier companies from the 1950s through the 1970s. Early CTS … Read more

BREADBOARD: How To

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