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Any suggestion for cheapest SET amplifier project

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100euro 2Watt SET amplifier

We're trying to design a 100euro Hi-Fun SET amplifier:

several version designed:

http://www.cdsoftware.it/primo/materiale/20_020_070_001_PRIMO_3000ohm.pdf

http://www.cdsoftware.it/primo/materiale/20_020_060_001_PRIMO_5000ohm.pdf

and the power supply:
http://www.cdsoftware.it/primo/materiale/20_060_010_001_SchemaAlimentatoreRev.pdf

and some cheap output trafos:
http://www.cdsoftware.it/primo/materiale/20_020_090_001_Trafo_JunkBox.pdf

italian text, but with some cooperation we can put it on english word document, if some people interested in cooperate.
 
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