Fender have schematics for their amps on their website (see http://www.fender.com/support/amp_schematics/ ). Many of their cheaper ones use opamp preamps (with diode or LED overdrive circuits) and chipamp power amps. My own Frontman 15G uses a 4560 in the front end with TDA2050 power amp. It's cheap and cheerful.
I'm in the process of replacing it, using a commercial DSP "amp modeller", low distortion power amp (a low-power version of http://www.littlefishbicycles.com/poweramp/index.html ) and some home-brew mini-monitor speakers (http://www.diyaudio.com/wiki/index.php?page=rabbitz+has+added ).
The end result will make guitar purists cringe (not a valve in sight), but I hope it will allow me to get really good, accurate tone without running the whole thing at ridiculous volume levels.
Cheers,
Suzy
I'm in the process of replacing it, using a commercial DSP "amp modeller", low distortion power amp (a low-power version of http://www.littlefishbicycles.com/poweramp/index.html ) and some home-brew mini-monitor speakers (http://www.diyaudio.com/wiki/index.php?page=rabbitz+has+added ).
The end result will make guitar purists cringe (not a valve in sight), but I hope it will allow me to get really good, accurate tone without running the whole thing at ridiculous volume levels.
Cheers,
Suzy
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