Not terribly rare, there are more than a few for sale, but a sonic superdisc.
Frequency
response is flat. Whereas the frequency response of conventional disks
is /- 2dB from 20 Hz to 20 kHz, that of UHQR discs is within /- 0.5
dB.Excellent channel separation. The channel separation
capability of UHQR discs has been improved by 9 dB at 300 Hz, by 12 dB
at 1 kHz, and by 6db at 10 kHz, as compared with that of conventional
discs.Distortion is so low that theoretical values have been
nearly achieved. Low, mid, and high range distortions have been improved
by 12, 10, and 6 dB or more, respectively.Mid-range disc
surface vibration has been reduced. Disc surface vibration in the
neighborhood of 700 Hz has been reduced by 10 dB.
This
disc comes in the factory sleeve and further, inside a foam-lined box.
The box includes the Technical Specifications Manual and a signed
Certificate of Authenticity, Pressing 1011. Please see the photos.
This
disc has been in my possession since it was purchased new in the
1980 s. It has been played maybe 10 times total. The vinyl is in near mint condition. The are some ticks in Catherine - track 1 on side 2, but that s it. Other than that, it is incredibly quiet throughout. The inner cardboard
sleeve is also MINT. The outer box shows some minor wear on the
cardboard finish as seen in photo .
This item will be packed in a new cardboard LP shipping carton with extreme care, fitting it s high value.
