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Thanks Mark, so can this ( WOPL 400 mod) be accomplished by someone with adequate soldering skills but minimal electrical circuit knowledge - I have built hafler amps from kits and repaired some of my own equipment when the defect was obvious but I do not have any formal electronics training. I...

Thanks everyone for your replies. So Lee and Joe, assuming the amp is currently functioning but stock only - no mods, what would you recommend modifying in a 400? In other words, what would you update in the amp if it were your amp? ( I am considering anything that is a potential problem...

Hi Folks, I originally posted this request on AudloKarma and NavLinear suggested I might join this site for some additional help (thanks Navo). Basicaly, I had a PL 400 amp from 1978 through 1982 and it worked flawlessly for all 4 years. The amp had been out on the market for enough years to...