I've become quite the Harman Kardon fan over the last year; I bought an AVR-247 HT receiver off their eBay store and was really blown away by the quality. I've since acquired a vintage PM655 integrated amp and FL8300 CD changer, and am watching the auctions and C-list for a suitable HK turntable.
It appears that virtually every HK product made still has full specs, owner's manual and service manual available on their site for download.
Also, don't be fooled by the apparently modest specs of their electronics. Harman Kardon is famous for conservative ratings and painfully honest specifications. That PM655 amp, for instance, while rated at 60 watts RMS has 45 amps per channel peak current. Their AVRs are spec'd with all channels driven; most manufacturers spec for only two channels driven at a time, which minimizes the tested load on their inadequate power supplies.
edit: I should really talk down their turntables, at least until I score mine. I don't need the competition on the auctions...