Marshall JCM 900 Model 4100 100-Watt Hi Gain Dual Reverb Head. These are true workhorse amplifiers, dual channel clean and lead. Dual reverb sounds absolutely amazing, it'll go from a light accent to a very deep ambient tone. Effects loop, ohm switchable, footswitch input for channel switching and reverb (footswitch not included). Sounds very good through anything from a 2x12/4x12/2x15...you'll be very impressed. Tube configuration is four 6L6 output valves, two ECC83 preamp valves. Overall it's in good shape with a few scuffs here and there and is fully functional and ready for your next gig!