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Goldring 2500

Moving Iron Cartridge with 2 SD Stylus Radius

Goldring 2000 series cartridges should be used with the standard moving magnet phono input of an integrated amplifier.

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Goldring 2500
All Goldring 2000 series cartridges feature Moving Iron technology. This lends them the high levels of detail associated with more expensive moving coil designs whilst retaining the convenience of a replaceable stylus and high output associated with moving magnet types. The cartridge employs a fixed samarium cobolt magnet and high output coil combination so that a very light iron/nickel cantilever end-piece can be used instead of the much heavier permanent magnet used in conventional designs. This reduces the moving mass allowing the stylus to trace the record groove more faithfully. Because of their high output, Goldring 2000 series cartridges should be used with the standard moving magnet phono input of an integrated amplifier.

The 2500 uses a nude, square shank, natural diamond stylus in a diagonal orientation with a proprietary 2SD line-contact profile. The stylus only contacts the groove wall along the short radius ridges which are so fine that it can accurately trace details down to 4 microns – enough for replay of quadraphonic records. Because the contact area is elongated along the complete side wall of the groove it is twice that of an ordinary elliptical stylus; mid-range tonality is incredibly accurate and precise and any high frequency sibilance or distortion is banished.

What is a Moving Iron Cartridge?
This type of generator is similar in operation to the moving-magnet type except that a very light, hollow, temporary magnet or armature is used instead of a small permanent magnet. This has the advantage that the moving parts of the generator can be made from light magnetic alloys and therefore have less mass, responding to the the groove wall more accurately. The cantilever transfers the mechanical vibrations from the record groove to the hollow armature. The magnetic field induced in it by the large fixed permanent magnet suspended above it induces a changing magnetic “flow” through the pole shoes which, in turn, generates an electromotive force in the fixed coils in proportion to the mechanical vibration.

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 MI cartridges have a relatively high output and require a 47 k? load impedance for current to flow making them compatible with the basic MM 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.

 

Harald Bialluch

We have a comprehensive selection of Goldring devices available for demonstration in our HiFi studios in Berlin-Kreuzberg. We look forward to your visit!

Device

Goldring 2500

Frequency Response 20 Hz - 20 kHz +/- 3 dB
Channel Balance  within 2 dB @ 1 kHz
Channel Separation better than 20 dB @ 1 kHz
Sensitivity 6.5 mV ±1.5 dB, 1 kHz @ 5 cm/sec
Static Compliance 35 mm/N
Dynamic Compliance @ 10 Hz 16 mm/N
Vertical Tracking Angle 24°
Stylus Radius 2 SD
Stylus Type replaceable
Cantilever Tapered Aluminium
Load Resistance 47 kOhm
Load Capacitance 100-200 pF
Internal Inductance 720 mH
Internal Resistance 550 Ohm
Cartridge Mass 7.4 g
Cartridge Mass (inc. fixings) 8.6 g
Fixing Centre 0.5" (12.7 mm)
Playing Weight 1.5 - 2.0 g (1.7 g nom.)
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