I sell this amp because too pouissant for guitar in mono or I exchange against an equivalent or marschall head with 4 x 34 el / or 88 kt / or 5550. for music I use a clone SONY TAF 2x300 watts autoconstruit for my little ... Jamo 200 pro adequate. it is a well moin cher SUPERAMPLI NAD 218 yet the heart is the same. regulates its power of + - + 85 volts - 125 volts depending on the Dynamics of the signal and its 28 large MOSFETs do not ask to speak less. This is the perfect amp for studio orchestra audiophile melomane. predict the preamp adeguat. I used a SONY TA4650 TLEV (hello depth the corp and even for 20khz pepe le) or a paradise for SONY 3FAES linearit. x guitar a pair of Mazda ECC83 with X-PLORER and THE PAUL GIBSON we forget that the earth is not alone ...