They look a bit heath robinson, but they sound good which is all that mattered to me. I am not technical , so i cant tell you much about the constuction , but they do have russian 6 P 1 valves. One input source , i think they are push pull ? and maybe 6 watts each output . If i had the expertise i would have put them into a nice chassis , but i don't ! Open to offer's . only selling as going abroad . I can't upload the photos here ! message me and i can send them through email .