100W Guitar Amplifier

Posted on Feb 19, 2013

The amp is rated at 100W into a 4 Ohms load, as this is typical of a `combo` type amp with two 8 Ohm speakers in parallel. Alternatively, you can run the amp into a `quad` box (4 x 8 Ohm speakers in series parallel - see Figure 5 in Project 27b, the original article) and will get about 60 Watts. For the really adventurous, 2 quad boxes and the amp head will provide 100W, but will be much louder than the twin.

100W Guitar Amplifier
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The preamp circuit is shown in Figure 1, and has a few interesting characteristics that separate it from the "normal" - assuming that there is such a thing. This is simple but elegant design, that provides excellent tonal range. The gain structu

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