Stereo Phono Cartridge. It will make any well recorded L.P. sound exactly like its master tape.
People in the record
business have known for a long time that a well recorded stereo disc is
potentially every bit as good as its master tape. Our founder and president.
Arnold Schwartz, created the Series 300 Micro-Point Recording Stylus - an ultra
precision cutting tool used to master the world's finest recordingd. (Over
two-hundred million records a year are manufactured from masters cut with our
Series 300 Micro Point Styli.) And it has been our experience that there's no
problem in getting the music onto the record the problem has been in retrieving
it.
The cartridge is the
culprit.
Until the advent of
the QDC-1, there really wasn't a cartridge on the market that could make a
stereo record sound as good as its master tape. So cartridge manufactures
didn't have to deal with an absolute standard of measurement for their product.
They sold their cartridges very much like loudspeakers , using subjective
criteria. In the end, the customer had to choose between the "sound"
of one cartridge or another. The fact is that a cartridge shouldn't have any
sound of its own. Ideally it should just be a direct link between the record
groove and the preamp input. That's precisely what the new QDC-1 is - an ultra
precision component that neither adds
nor detracts from the music you hear. And because it does what it does
so well, it will change the way all cartridges are judged. Now a cartridge's
performance can be measured against a completely reliable abjective standard.
Stated simply;
"Does a cartridge make a well recorded disc sound identical to its master
tape? Or doesn't it?" our does. Here's why.
[1] The QDC-1 Series 300 playback styli (QDC-1e, 1s,
1q) are shaped and polished with the same ultra precision as our world famous
Micro-Point recording styli. These styli follow the complexities of the record
groove with greater tracing accuracy than heretofore obtainable.
[2] The QDC-1 stylus
bar is directly attached to its transducer, eliminating the losses inherent in
standard flux field coupling. This unique method of lossless coupling provides
a faster response time than any other known system.
[3] The QDC-1 stylus
is balanced by two elastic bearings positioned to provide precise 45°-45°
signal resolution. This symmetrical configuration precisely controls stylus
excursion from minimum to maximum groove amplitude, without the floppy
overshoot of conventional single bearing designs.
[4] The QDC-1 electret
transducer puts out a perfectly linear signal from 5 Hz to 50 kHz, without the
phase shift normally associated with inductive transducers. Its reproduction of
complex wave forms is equal to the best direct coupled amplifiers.
Specifications
Stylus Configuration
(User Replaceable):
QDC-1e : .0002 x .0007 elliptical solid nude diamond
QDC-1s :
.0005 spherical soild nude diamond
QDC-1q :
Quadra-Point/CD-4 solid nude diamond
Frequency
Response:
QDC-1e : 5 Hz
to 20 kHz ±2 dB
QDC-1s : 5 Hz
to 20 kHz ±2 dB
QDC-1q : 5 Hz
- 50 kHz ±3 dB
Tracking Force
Range:
QDC-1e : 0,75 to 1,5 grams
QDC-1s : 0,9
to 1,5 grams
QDC-1q : 0,9
to 2,0 grams
Channel
Separation:
QDC-1e : Nominally 30 dB at 1 kHz (nominally 20 dB at
10 kHz)
QDC-1s :
Nominally 30 dB at 1 kHz (nominally 20 dB at 10 kHz)
QDC-1q :
Nominally 30 dB at 1 kHz (nominally 15 dB at 20 kHz)
Output Voltage: 3,5 mV each channel at 5 cm/sec peak recorded
velocity
Load Impedance: 47 k Ω