The classic sound comes from an old-style tube preamp, a tube compressor, a simple 3-band passive EQ section, a “Colour” filter (a tube adaptation of the famous Markbass VLE control), and an innovative Tube Technology Emulator power amp , 500W @ 4 ohms / 300W @ 8ohms Bought for a one off gig can’t see me using it again, it’s a great head nice mark bass tone comes with carry case ,open to reasonable offers also can be sent by post any questions feel free to ask thanks for looking.