Hi Guys just out of curiosity i'd like to try and get an idea when my vibro champ (silver face) was made. The amp has 014077 and (E1) A606 930 stamped on the transformer. on the chassis it has F111 615 then underneath that in a sort of ink stamp it has 1859. The tube chart is still in the bottom but doesn't have seem to have any numbers of letters on it apart from the "manufactured under the following patents" 2817708 and 192859. The tube chart also has this code in the lower left corner 010388F. The power valves say GT 3y5, GT 6v6, 2x 12AX7. One of the power tubes is totally different to the other one its sort of narrower at the top then bulbs out towards the bottom then thins out towards the very bottom of the valve.It has "made in Canada and the word "marconi" (i Think) written on it. Please excuse my ignorance in these matters I'm just learning!! Any information would be welcome, sorry again for my absolute lack of knowledge on these matters! Kind regards Craig.