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
Click here to download the full size of the above Circuit.

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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