Old Classical Recordings

I was wondering if somebody could help me with a problem I've just encountered.

I'm listening to a recording of Hans Knappertsbusch conducting the Wagner Ring in 1956 (Label: Orfeo). I noticed that if I turn the volume up, the voices start . . . clipping seems like the best word. Especially with the soprano, it seems to overload and you end up with a sort of tinny buzz.

I haven't gotten this sort of response on any other recordings before. It doesn't sound like the amp is out of power because the bass sounds fine. I was wondering if this is something that older classical recordings tend to suffer from? Is there anything I can do to help this? I was thinking that part of the problem might be the CD player I'm using, which is an old Marantz from the early 90s - perhaps the filtering is having problems resolving the high frequencies through all the noise.

Thanks for any help you can give.
Hummmmm.....could be many things.
Probably how the cartridge and stylus are tracking on the record.

Is it a mono recording? A stereo stylus and cartridge will not get the best results...