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Fidelity-research FR-7fc Pure Moving-Coil Phono Cartridge * VG ++ working cond
Fidelity-research FR-7fc Pure Moving-Coil Phono Cartridge * VG ++ working cond
Perfect working condition.
Specification:
An improved version of the FR-7, this is a shell-integrated MC cartridge.
It uses a unique push-pull power generation method with a magnetic circuit consisting of two magnets and four poles.
By generating power at four points, this method can produce a sufficiently large output voltage even with a low impedance coil. In addition, while a cancellation current is generated in the power generation circuit in a general method, the FR-7f's magnetic circuit can produce a positive output even in the conventional cancellation current generation area. This improves the phase characteristics and crosstalk characteristics, significantly increases the electrical conversion efficiency, and improves the output power.
A samarium-cobalt magnet is used for the magnetic circuit material. This magnet has a high coercive force compared to general alnico magnets and has the excellent characteristic of being less susceptible to self-demagnetization, so the initial characteristics of the magnetic circuit are maintained for a long time.
Perfect working condition.
Specification:
An improved version of the FR-7, this is a shell-integrated MC cartridge.
It uses a unique push-pull power generation method with a magnetic circuit consisting of two magnets and four poles.
By generating power at four points, this method can produce a sufficiently large output voltage even with a low impedance coil. In addition, while a cancellation current is generated in the power generation circuit in a general method, the FR-7f's magnetic circuit can produce a positive output even in the conventional cancellation current generation area. This improves the phase characteristics and crosstalk characteristics, significantly increases the electrical conversion efficiency, and improves the output power.
A samarium-cobalt magnet is used for the magnetic circuit material. This magnet has a high coercive force compared to general alnico magnets and has the excellent characteristic of being less susceptible to self-demagnetization, so the initial characteristics of the magnetic circuit are maintained for a long time.
The power generation coil uses a completely air-core coil without a winding frame, so unnecessary magnetic material does not move within the power generation magnetic field, fundamentally eliminating distortion of the playback signal. In addition, the effective mass of the vibrator can be reduced to about two-thirds, reducing the mechanical impedance in the high range.
The stylus tip is a unique refined contact stylus made of a specially polished 0.15mm square solid diamond.
The refined contact stylus is a new method that combines the advantages of both line contact stylus and elliptical stylus, and is less susceptible to adverse effects (noise, etc.) caused by disc warping and dust in the sound groove. In addition, scratch noise and surface noise are extremely rare, resulting in clear playback sound that is easy to listen to.
A special aluminum alloy cantilever is used for the cantilever. This is a straight cantilever made of a highly corrosion-resistant special aluminum alloy that has been optimally heat-hardened (ceramic-treated), and is designed to minimize the moment of inertia and deflection during high-speed movement.
The structure in which the top of the string holder extends to the front of damper B makes the fulcrum position clearer. This makes the cantilever vibration fulcrum position clearer and minimizes the change in the cantilever vibration distance for each frequency.
In addition, the string wire that applies tension to the cantilever is made of a material with a very high spring coefficient and little change over time, which contributes to improving the square wave characteristics.
The double damper system is used, and by using a two-layer damper structure with different rubber coefficients, the mid-high and mid-low ranges of vibration frequencies are effectively damped, allowing ideal tracing across the entire playback frequency range.
In addition, the different rubber coefficients of damper A and damper B reduce the overall effect of temperature on tracing performance, mechanical impedance characteristics, and playback sound.
To solve the problem of the coil lead wire vibrating along with the cantilever, the coil lead wire is inserted and crimped between dampers A and B to eliminate unnecessary power generation by the lead wire.
The head shell is designed to completely remove dead space, which is a cause of parasitic vibration that is harmful to sound quality. In addition, a special aluminum alloy is used for the shell material, and impact processing (cold forging) is used to further increase rigidity and prevent the occurrence of split resonance.
The cartridge body material is made of epoxy resin selected through careful listening tests.
In order to improve the lack of strength caused by the rattle between the arm and connector, a special stainless steel lock plate is used instead of the conventional guide pin. This makes it possible to more firmly connect with the arm and keep it level.
Output power 2x10-8W (5cm/sec.45°)
Needle pressure 2g-3g
Coil impedance 2Ω
Load impedance 3Ω
Playback frequency range 10Hz-45kHz
Channel balance 1dB (1kHz)
Channel separation -28dB (1kHz)
Compliance 7x10-6cm/dyne (100Hz, 20℃)
Needle tip 0.15mm square refined contact solid diamond needle
Weight 30g
The stylus tip is a unique refined contact stylus made of a specially polished 0.15mm square solid diamond.
The refined contact stylus is a new method that combines the advantages of both line contact stylus and elliptical stylus, and is less susceptible to adverse effects (noise, etc.) caused by disc warping and dust in the sound groove. In addition, scratch noise and surface noise are extremely rare, resulting in clear playback sound that is easy to listen to.
A special aluminum alloy cantilever is used for the cantilever. This is a straight cantilever made of a highly corrosion-resistant special aluminum alloy that has been optimally heat-hardened (ceramic-treated), and is designed to minimize the moment of inertia and deflection during high-speed movement.
The structure in which the top of the string holder extends to the front of damper B makes the fulcrum position clearer. This makes the cantilever vibration fulcrum position clearer and minimizes the change in the cantilever vibration distance for each frequency.
In addition, the string wire that applies tension to the cantilever is made of a material with a very high spring coefficient and little change over time, which contributes to improving the square wave characteristics.
The double damper system is used, and by using a two-layer damper structure with different rubber coefficients, the mid-high and mid-low ranges of vibration frequencies are effectively damped, allowing ideal tracing across the entire playback frequency range.
In addition, the different rubber coefficients of damper A and damper B reduce the overall effect of temperature on tracing performance, mechanical impedance characteristics, and playback sound.
To solve the problem of the coil lead wire vibrating along with the cantilever, the coil lead wire is inserted and crimped between dampers A and B to eliminate unnecessary power generation by the lead wire.
The head shell is designed to completely remove dead space, which is a cause of parasitic vibration that is harmful to sound quality. In addition, a special aluminum alloy is used for the shell material, and impact processing (cold forging) is used to further increase rigidity and prevent the occurrence of split resonance.
The cartridge body material is made of epoxy resin selected through careful listening tests.
In order to improve the lack of strength caused by the rattle between the arm and connector, a special stainless steel lock plate is used instead of the conventional guide pin. This makes it possible to more firmly connect with the arm and keep it level.
Output power 2x10-8W (5cm/sec.45°)
Needle pressure 2g-3g
Coil impedance 2Ω
Load impedance 3Ω
Playback frequency range 10Hz-45kHz
Channel balance 1dB (1kHz)
Channel separation -28dB (1kHz)
Compliance 7x10-6cm/dyne (100Hz, 20℃)
Needle tip 0.15mm square refined contact solid diamond needle
Weight 30g
$800.00
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