Dating my 112RD Fifty

Hi all! Could use some help on my new amp!
Chassis # 1650-RD-DOM
Serial # EN06601
And on the Transformer, the first line says "8-50" and the second line says "EIA606-136" Thanks! BTW mine still has the pristine unused warranty card and instruction manual in its little manila envelope, and the original tall glass green label Sylvania tubes, tested still strong!
I've only had it for a week but already I've been playing it like a madman - here are some clips!http://youtube.com/watch?v=1j7J4fPHMpwhttp://youtube.com/watch?v=tAxaqm7gbHkhttp://youtube.com/watch?v=gLTXpyD5FhIhttp://youtube.com/watch?v=1Zqxgm1icNc

"136" means 36th week of 1981.
Tell us any other code (on the caps, opamps, diodes, O.T.) if you can read it.
On components usally there are 4 digits: yyww or wwyy.

Very cool, so mine is from the 2nd year of production! Thanks! Hmm, didn't see too much in the way of caps/diodes on the underside of the chassis, im too scared to open it up! But that's good enough for me and that year makes sense. Thanks again!