Guitar Amplifier

Posted on Feb 5, 2014

The aim of this design is to reproduce a Combo amplifier of the type very common in the `sixties and the `seventies of the past century. It is well suited as a guitar amplifier but it will do a good job with any kind of electronic musical instrument or microphone. 5W power output was a common feature of these widespread devices due to the general

Guitar Amplifier
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adoption of a class A single-tube output stage (see the Vox AC-4 model). It also features a two-FET preamplifier, two inputs with different sensitivity, a treble-cut control and an optional switch allowing overdrive or powerful treble-enhancement. * In all cases where Darlington transistors are used as the output devices it is essential that the sensing transistor (Q4) should be in as close thermal contact with the output transistors as possible. Therefore a TO126-case transistor type was chosen for easy bolting on the heatsink, very close to the output pair. * Set the volume control to the minimum and Trimmer R9 to its minimum resistance. * Power-on the circuit and adjust R9 to read a current drawing of about 25 to 30mA.

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