5150 II Features :
120 Watts RMS at 16, 8 or 4 Ohms voiced to Edward Van Halen's specifications and identical to the amps used by him when touring and recording
Six 12AX7 preamp and four 6L6 power amp tubes
Footswitchable lead/rhythm channel select and effects loop
3-band EQ, resonance and presence controls on each channel
Rhythm channel: pre-/post-gain controls
Bright/crunch switches
Lead channel: pre-/post-gain controls
5150 Features :
120 Watts RMS into 16, 8 or 4 Ohms
Five 12AX7 preamp tubes
Four 6L6GC power amp tubes
High and low gain inputs
2 channel preamp switchable on front panel or remote footswitch
Rhythm channel: pre- and post-gain, bright & crunch switches
Lead channel: pre- and post-gain
Channels share 3-band EQ, presence, and resonance controls
Switchable post-EQ effects loop
5150 II has a better sounding clean channel but the gain sounds different from the original. aLot of people
mod the lead channel circuitry to get back to the original lead channel .
http://fjamods.com/5150II.html