I pulled off the back off my homemade cabinet , and was looking at the back of the old A130 that I have .....I was wondering if it was all original ... I guess it's about 30 + years old , because there was a sticker that said 'Sam Ash 4/30/74' .....but on the cone there is a stamp of AST15S , and the serial number is 10024 .. any way I can tell if it was ever reconed ? Thanks in advance ..