Thought it may be a good idea to get these amps altogether, getting everything in files etc, easier I suppose for new searcher's to get straight there, so here goes. It's a 1970 with all original valves, Tungsol 6550's, 12DW7 Mullard's and GE 12BH7's, very little use and showing no signs of anything needing attention, that's 40 years , awesome. I've gone through the whole thing and found dates ranging from 6/69 to 48th wk 70 on the pot's and serial number is 102xxx. Notice the number 40 on the pre amp, the matching 40 is just behind the input transformer on the chassis. I really love playing through this baby and always get so much interest at gigs, but have always been jealous of JimmyM's stencil's on his and those 6146b's of course.