Description
Pioneer C-21 Stereo Pre-Amplifier Hifi Control Amplifier Transistor Silver JUNKDescriptionType Stereo preamplifierCircuit system Equaliser amplifier section: differential 2-stage current mirror amplification Class-A SEPPControl amplifier section: Differential 2-stage current mirror amplification Class-A SEPPInput terminals Phono: 2.5mV/100?, 10k?, 25k?, 50k?, 75k?, 100k?Cartridge load capacitance: 100pF, 150pF, 200pF, 300pF, 400pF, 500pFAUX 1, 2, Tape Play: 150mV/50k?Phono maximum permissible input 300mV (1kHz, harmonic distortion 0.01%)Output terminals Tape Rec:150mV/1k?Output(RL:50k?):1V/450?(rated), 20V/150?(MAX)Harmonic distortion (20Hz to 20kHz) Phono: 0.006% (at 1V output, volume -20dB, gain control 0dB)AUX: 0.005% (at 1 V output, gain control 0 dB)Frequency responsePhono: 20Hz to 20kHz ±0.2dBAUX: 10Hz to 100kHz +0 -0.2dB3Hz to 300kHz +0 -1.0dBSN ratio (IHF, A-network,Short circuit) Phono: 80dB (at 1V output)AUX: 100dB (at 1V output)Phono subsonic filter 15 Hz, 6 dB/oct.Semiconductors Transistors: 36Diodes, others: 47Power supply voltage 100 V, 50 Hz/60 HzPower consumption (Electrical Appliance and Material Control Law) 10WAC outlets Power switch interlocked: 3Power switch not interlocked: 2 systemsDimensions W 420 x H 81 x D 357 mm A preamplifier with a simple configuration that returns to the basics of preamplification and pursues sound quality, focusing on single functions to achieve high purity of sound quality. The circuit system of the equaliser amplifier uses a differential 2-stage, current mirror circuit Class-A SEPP.This circuit, which focuses on reducing distortion and improving the signal-to-noise ratio, improves various characteristics.Furthermore, carefully selected elements are used for the equaliser element, such as a precision small metal film resistor with a resistance error of ±0.5% and a temperature characteristic of ±100 ppm/°C, and a polypropylene capacitor with a capacitance error of ±1%.A high voltage of ±37 V is applied to this circuit to ensure a generous dynamic margin of 300 mV maximum permissible input for a sensitivity of 2.5 mV. To ensure the performance of various cartridges, six types of load resistance and six types of load capacitance can be selected independently, for a total of 36 different cartridge load settings.The 100 ? load resistance position is suitable for direct connection of MC cartridges with high output voltage. Like the equaliser section, the flat amplifier section uses differential two-stage amplification.A low-noise transistor is used in the first stage and a current mirror circuit is employed in the intermediate amplification stage, which, together with the use of carefully selected elements, ensures a frequency response of 10 Hz to 100 kHz +0 -0.2 dB, distortion ratio 0.005% and SN ratio 100 dB. The power supply section consists of a constant-voltage power supply with L/R independent winding transformers, which is large for a preamplifier, and eliminates mutual interference between channels.Two independent L/R reed relays are used in the muting circuit, and the function switches are also specially designed with spacers to reduce interference between channels, thus emphasising the quality of stereo reproduction. The volume uses a 32-step attenuator type with silver-printed contacts. The flat amplifier output stage has a gain control with L and R independent 22-contact attenuators.The contacts are treated with silver palladium. Shipping FedEx?or DHLInternational Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying. Thank you for your understanding.
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