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Further information: 40 Watts x 2 channels 4 RCA inputs, 4 and 8 Ohms speaker output https://www.primaluna-usa.com/prologue-two I have had this amp for about 4 years, the current tubes have around 400-450 hours of use. It has a small chip on the body at the back of the unit Excellent build and sound. Tubes included are Electro Harmonics EL-34, JAN 2 x 5814 and Primaluna 2 x 12AX7 Has Adaptive Auto Biasing, and you can use 6550, KT90, EL-34, KT77, 6CA7, 6L6GC, KT66, 7581, EL37, and any of their equivalent power tubes.