1012GX Moving Magnet Cartridge

by Goldring

$550.00
OR

Goldring 1012GX

This hand-built cartridge uses the acclaimed Gyger II nude diamond stylus. A fine-line elliptical type with a 6 µm small radius it gives smooth, extended highs, low distortion and reproduces a highly detailed and dynamic sound. Advanced diamond tip polishing ensures excellent tracking ability and reduces record wear. Because it fills the record groove more completely due to its larger major radius, the Gyger II represents a major upgrade over normal elliptical stylus types.

Features

Low Mass Pocan® Body

The 1000 series uses a strong one piece body which holds the fixed parts securely in place. Made from a special type of ultra-rigid, glass reinforced polyester called Pocan, the body can be tightly bolted to the head shell for maximum efficiency and optimum sound quality. The user replaceable stylus carrier slots tightly into the body with a locating pin preventing unwanted vibrations which would otherwise colour the sound. An integral mu-metal can keeps the generator parts shielded from hum-inducing stray magnetic fields. Because Pocan has a high strength-to-mass ratio, the overall mass of the G1000 series cartridges is kept below 6.5 g. Low mass and moderate compliance keep the natural arm/cartridge resonance within safe limits for easy matching to a wide range of tonearms. 

High Efficiency Magnetic Circuit

Finely etched mu-metal is laminated to form the pole pieces around which are fitted two formerless coils of four thousand turns each. This unique design reduces mass and also makes for a very efficient magnetic circuit producing a higher than average output. This construction also reduces the loss at high frequencies inherent in conventional designs, making for a smooth and extended frequency response. 

Reduced Moving Mass

The 1000 series uses a unique ultra-low-mass, micro-miniature Alnico V magnet made to a tolerance that can be achieved by no other manufacturer worldwide. Welded to the magnet is a gold plated nickel tie-bar which provides an earth path for vinyl static charge build up and stabilses the cantilever in unwanted vibrational modes. The whole ultra-low-mass assembly is then mounted in a special butyl rubber polymer with optimised damping characteristics. 

Expert Adjustment

The correct setting of stylus azimuth (or horizontal tracking angle) is essential for the maintenance of a proper stereo sound stage. Azimuth is the term used to describe the angle that the vertical centre-line of the stylus makes with the record surface and this must be exactly perpendicular to the record groove. This is not usually a user adjustable parameter on most budget decks and so it is vital that the cartridge leaves the factory with the azimuth precisely set. Badly adjusted azimuth can cause uneven channel balance and increased crosstalk between channels which would severely degrade the stereo image. 

Specifications

  • Frequency Response:  20 Hz - 20 kHz +/- 3 dB
  • Channel Balance:   within 2 dB @ 1 kHz
  • Channel Separation:  better than 25 dB @ 1 kHz
  • Sensitivity:  6.5 mV +/- 1.5 dB, 1 kHz @ 5 cm/sec
  • Static Compliance:  20 mm/N
  • Dynamic Compliance @ 10 Hz:  10 mm/N
  • Equivalent tip mass:  0.45 mg
  • Vertical Tracking Angle:  24°
  • Stylus Radius:  Gyger II
  • Stylus Type:  Replaceable
  • Load Resistance:  47 kΩ
  • Load Capacitance:  150 - 200 pF
  • Internal Inductance:  570 mH
  • Internal Resistance:  660 Ω
  • Cartridge Mass:  6.3 g
  • Cartridge Mass (inc. fixings):  7.6 g
  • Fixing Centre:  0.5" (12.7 mm)
  • Playing Weight:  1.5 - 2.0 g (1.7 g nom.)
  • Replacement Stylus:  1012GX - D12GX

What is a Moving Magnet Cartridge?

All transducers of this type depend on Faraday's Law of electromagnetic induction which implies that a conductor placed in a varying magnetic field will have an electromotive force, or e.m.f., induced in it proportional to the rate of change of the field. If a permanent magnet is suspended at or near the poles of a coil with an iron core, the coil will experience the required variable magnetic flux if the magnet is moved. A cantilever transfers the mechanical vibrations picked up from the record groove by the stylus directly into the permanent magnet. The changing magnetic field it produces induces a magnetic “flow” through the pole shoes which, in turn, generates an e.m.f in the fixed coils in direct proportion to the mechanical vibration. In this way, the sound wave captured as undulations in the record grooves has been converted into a tiny electrical signal which can then be amplified and converted back into sound by the speakers. 

The coil must be connected to a special phono amplifier input via the turntable leads so that the low voltage generated by the cartridge (typically 5 mV) is boosted to several volts to drive the speakers. All MM cartridges have a relatively high output and require a 47 kΩ load impedance for current to flow making them compatible with the basic phono input found as standard on many integrated amplifiers. If your amplifier does not feature a MM phono input, these can be purchased separately at a reasonable cost.

Goldring 1012GX Moving Magnet Cartridge

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