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No way will you ever see 500 watts from that thing !   Done properly and driven properly you might see 200 watts output.  Always important to keep in mind too is that these CB type amps never seem to have low pass filters installed, which means a percentage of radiated power is going into the harmonics. This is not a good thing as it means less power on the fundamental frequency and more interference to other services (due to the harmonic radiation).  Do your neighbors and fellow radio users a big favor and buy a Low Pass Filter to put on the output.