Lyra Kleos Mono Phono Cartridge
Although many MC cartridges have good performance, their sound is held back by how they are designed. The problem is, the signal coils should have the same angle as the magnetic circuit during playback, but MC cartridges are typically designed so that the opposite happens - applying normal tracking force pushes the coils out of alignment. This impairs coil sensitivity and linearity, and reduces sound quality. Lyra's "New Angle" technology solves this fundamental problem by compensating for how the signal coils are affected by vertical tracking forces, and optimally aligning the coils when it matters most - during playback. Introduced on our entry-level Delos, the New Angle technology enables the Delos to perform well above its pricepoint. On mono records, the vertical axis of the groove contains no musical information, but it will frequently have noise, in the form of groove damage and dirt. The Kleos Mono has therefore been designed to be completely insensitive to the vertical axis, which greatly improves the signal/noise ratio without any downside on monaural records. The coil former is a square permeable plate oriented parallel to the record surface rather than the 45-degree angle used for most stereo cartridges, while the coils are wound so that they only generate a signal when there is horizontal movement of the stylus and cantilever when tracking a record. Two totally separate monaural coils are used in the Kleos Mono, since most monaural cartridges are used with stereo amplifiers and stereo speakers. The separate coils also help avoid possible ground loops and hum problems that could otherwise be caused if a single coil is fed into a stereo two-channel amplification system, thereby tying the two channels together electrically.
Designer: Jonathan Carr Builder: Yoshinori Mishima (final build, testing), Akiko Ishiyama (preliminary build) Type: Medium weight, medium compliance, low-impedance moving coil cartridge Stylus: Lyra-designed long-footprint variable-radius line-contact nude diamond (3um x 70um), slot-mounted Cantilever system: Solid boron rod with short one-point wire suspension, directly mounted into cartridge body Coils: 2-layer deep, 6N high-purity copper, square-shaped chemically-purified high-purity iron former, 5.4ohm self-impedance, 9.0uH inductance Output voltage: 0.5mV@5cm/sec., zero to peak, 45 degrees (CBS test record, other test records may alter results) Frequency range: 10Hz ~ 50kHz Compliance: Approx. 12x10-6cm/dyne at 100Hz Vertical tracking angle: 20 degrees Cartridge body: One-piece machining from solid 7075 alloy billet, with reduced-surface higher-pressure headshell contact area, partially non-parallel shaping, phase-interference resonance-controlling mechanism, and body threaded directly for mounting screws Cartridge mounting screws: 2.6mm 0.45 pitch JIS standard Distance from mounting holes to stylus tip: 9.5mm Cartridge weight (without stylus cover): 8.8g Recommended tracking force: 1.65 ~ 1.75g (1.72g recommended) Recommended load directly into MC phono input: 95.3ohm ~ 816ohm (determine by listening, or follow detailed guidelines in user manual) Recommended load via step-up transformer: 5 ~ 15ohm (step-up transformer's output must be connected to 10kohm ~ 47kohm MM-level RIAA input, preferably via short, low-capacitance cable) Recommended tonearms: High-quality pivoted or linear tangential) tonearms with rigid bearing(s), adjustable anti-skating force, preferably VTA