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Here is the final explanation from product specialist Trent Blake: In May of 1993 your amp was sent to us by our UK Distributor at the time (Rock Road Co.) for a clean mod update. This required the use of a new circuit board and associated parts. Best regards Nico

Here are the pics: http://i21.servimg.com/u/f21/12/50/60/05/dsc07910.jpg http://i21.servimg.com/u/f21/12/50/60/05/dsc07911.jpg Accordig to this very interesting thread, it seems I have the rev F main board layout (and R1-1F is written on it)...

Hi, I've purchased a Dual Rectifier many years ago and I always thought it was a rev C or D as its serial number was R026X. It has all pre-rev. G outer criteria (power transformer and output transformer S/N, loop, covering, power chord etc.). However I never checked the board revision, until...