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Not only that but some of their circuits use crappy op-amps like the LM358.audioguru said:Semiconductor manufacturers have hundreds of simple and good sounding amplifier ICs.
Most "amplifiers" from the Techlib site don't have negative feedback from their output so they will have horrible distortion.
I simulated a Techlib amplifier. At a low output level it has crossover distortion. At an output of a whopping 0.17W its distortion is horrible.