At least 3 copys then (Marco) great record reminds me of that Rare thing on True Glow Town "Bolder n Bold Dagain -- Bolder N Bold Dagain" Doh!!!!, can't remeber its name.
Would expect both channels to hiss if the record had been ground away by heavy needle play and not just one side. Hve you tried the mono play it can be difficult with most amps being stereo. Could wire the cartridge positives with a fine wire.