This is only a correction for Previous notice indicating that the kit changes the type of amplification to move from Class B Class A, which is false sr, the two lights continue to operate in push-pull, but the power that can provide an EL84 is 10 while a 12 w EL34 can range from 25 30 w. So what makes a fall of between a factor of 2 and 3. Or divide the power of two, REPRESENTATIVES not a drop of 3 dB, the limit REPRESENTATIVES perceptible by the human ear. conclusion: even without trying this kit, good sense of the physicist warned, lets say it is the equivalent of Cautrès on a wooden leg!