| YAMAHA C2 preamplifier original super low noise FET a little scratched and dirty
- Condition: Used
- Price: 687.32 EUR
- Status: unsold
- Item number: 405406241552
- Seller: zorokuharico (317|99.4%)
- Seller information: Commercial (with base shop)
- Item location: Miya-waki,Japan
- Ships to: Americas
- Shipping: 0,0 EUR
- on EBAY
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Description
Product description Preamplifier using Yamahas original super low noise FET.The basic circuit configuration is simple: an equalizer amplifier, a tone control amplifier, and a head amplifier for MC cartridges. In order to pursue performance as a preamplifier, accessory circuits are kept to a minimum and excellent characteristics are achieved.The equalizer circuit uses Yamahas original super low noise pair FET, and the circuit configuration is cascode bootstrap current mirror differential input, Darlington connection constant current load emitter grounding amplification, and pure complementary parallel push-pull class A output stage. I am.The super low noise FET used for the first stage differential amplification was newly developed for the C-2, and has extremely low noise and uniform electrical characteristics. This differential amplification stage operates with a constant current bias with a current mirror cascode bootstrap, eliminates the input DC cut capacitor to suppress noise and deterioration of low frequency stability, and uses a cascode bootstrap circuit to suppress the signal source. This prevents distortion rate deterioration due to impedance changes.In the second stage circuit, the load on the first stage is lightened by grounding the constant current load emitter of Darlington connection, and the gain is sufficiently obtained. The output stage has a high high limit frequency (ft?100MHz) and is a pure complementary class A parallel push-pull circuit using two sets of transistors with well-matched complementary characteristics, and the output impedance is lowered (600?). A large output voltage is obtained at a low distortion rate while improving stability.High-quality styrene capacitors and metal film resistors are used for the RIAA elements in the equalizer circuit, achieving high accuracy within ±0.2dB.amplifierThe equalizer amplifier circuit is double shielded.The circuit configuration of the tone control unit amplifier is almost the same as that of the equalizer amplifier, and is an NF type tone control circuit, and both Bass and Treble use a 20-step, 21-position high-precision attenuator. In addition, in the 0 position, the element with the time constant is completely separated from the circuit, and the tone amplifier becomes a flat buffer amplifier.A volume control is inserted before the tone amplifier, but if you turn down the volume, the signal source impedance as seen from the tone amplifier will change. Like the equalizer amplifier, the C-2 tone amplifier employs a cascode bootstrap circuit in the first stage, so there is no deterioration in distortion even when the volume is turned down during actual use. In addition, the output impedance is as low as 400? due to the complementary class A parallel push-pull output stage, and combined with the high power supply voltage, a maximum output of 10V (10k? load) can be obtained against the rated 775mV (0dBm), and under a 600? load condition. It can also be used.The head amplifier section uses Yamahas original super low noise IC, achieving an S/N ratio of over 70dB.Equipped with a subsonic filter, it can cut unnecessary ultra-low-frequency signals caused by warped records, etc.The volume uses two high-precision special four-volume volumes per channel. These two volumes are connected to the input and output sides of the tone amplifier, and the range from -? to -20dB is adjusted at the output side of the amplifier, and the range from -20dB to 0dB is adjusted at the input side of the amplifier. With this method, residual noise becomes completely zero when the volume is turned all the way down.A muting circuit using a relay is inserted not only at Pre out but also at Rec out.As a result, the output impedance is low and there is no characteristic deterioration even when various related devices are connected. amplifierCutting type terminals are used for input/output terminals and ground terminals.?Main specificationsModel control amplifierInput sensitivity/impedance Phono1/2: 2mV/47k?Phono3(MC):50?V/10k?Tuner, Aux: 120mV/47k?Tape PB A/B:120mV/47k?Maximum allowable inputPhono1/2: 30mV(20Hz) 300mV(1kHz) 3000mV(20kHz)Phono3: 1.25mV(20Hz) 7.5mV(1kHz) 20mV(20kHz) Output level/impedance Pre out 1/2:775mV/400?Rec out 1/2:120mV/660?Frequency characteristics Phono1/2/3 (RIAA deviation): 30Hz to 15kHz ±0.2dBTuner, Aux: 5Hz - 100kHz +0 -1.5dBTape A/B: 5Hz - 100kHz +0 -1.5dBSN ratio (IHF-A network)Phono1/2: 85dB (input short at 2mV rated input)99dB (input short when inputting 10mV)Phono3: Tuner, Aux:70dB (at 50?V rated input, input 50? short)100dB (input short)Residual noise -?dBdistortion ratePhono1/2: 0.003% or less (VRmax, 7.75V output)0.003% or less (VR-30dB, 775mV output)Phono3(MC): 0.02% or less (VRmax, 7.75V output)Tuner, Aux, Tape A/B: 0.05% or less (VR-30dB, 775mV output)0.003% or less (VRmax, 7.75V output)0.003% or less (VR-30dB, 775mV output)tone controlCutoff frequency?Bass:350Hz?Treble:3.5kHzAmount of change (Bass: 20Hz, Treble: 20kHz)?0, ±1.5, ±1.5, ±2.0, ±3.0, ±4.0, ±5.0, ±6.0, ±8.0, ±10dBSubsonic filter 15Hz, 12dB/octMuting -20dB, offSemiconductor IC used: 2 piecesFET module: 4 piecesFET: 2 piecesTransistor: 61 piecesZener diode: 7 piecesDiode: 23 piecesPower supply AC100V, 50Hz/60HzPower consumption 25WExternal dimensions Width 435x Height 72x Depth 320mmWeight 7.8kg?The condition of the product is used and has some scratches and dirt due to daily use.You can see fine scratches and hits.For remote delivery areas, additional fees will be charged. Import duties,taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility. These charges are normally collected by the delivering freight(shipping) company or when you pick the item up. -do not confuse them for additional shipping charges. We do not mark merchandise values below value or mark items as gifts. -US and International government regulations prohibit such behavior.
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