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Hi all. Just found you guys after searching for info about my D500. I purchased it new after selling a 400 and then a 700b all back in the 70's. I worked for a local Hi Fi shop in the Philadelphia area back then. Still have a 4000 also. They have been sitting for years and it is time to dust...

Hi everyone, I just discovered this site while searching for info on my PL D500. Serial # 2470. I purchased this amp new back in 1977 I believe. I sold my 700b to buy it , and sold my 400 to buy the 700b. I used it pretty consistently until around 1990 and it developed distortion in one...