Description
90W E405 Class A Power Amplifier Board A1943 C5200 and 2SA1930 2SC5171 Large Tube Quiescent Current 100MA
Product Description
The use of high-quality original parts not only guarantees safety and quality, and has a long service life, but more importantly, it is a strong guarantee that the actual performance can reach the design goal. The pursuit of first-class quality is our consistent aim. Golden Throat E405 is an upgraded version of E305. It also belongs to the diamond diamond structure of FET double differential input. It has extremely low crossover distortion. Unlike E305, E405 is pure DC, and the entire circuit does not have a coupling capacitor. Without feedback capacitor, it belongs to the current negative feedback type, with excellent dynamic response and diving depth. This line refers to the pure rear stage of Golden Throat E405, with DC servo circuit (played by OP07 with extremely low noise), Omron relay +C1237 Speaker protection escorts your speakers; increase output overload and overcurrent protection. E405 sound characteristics: natural and slender, wide sound, great dynamic effect is very good, the biggest feature is the deep bass diving.
Feature
1. Use original Toshiba A1943/C5200 and 2SA1930/2SC5171. 2, The inter-stage coupling capacitor adopts WIMA's top-level capacitor 1UF, and the main circuit of electrolytic capacitor signal adopts imported Panasonic famous brand to ensure strong continuous power support. 3, The resistance uses five-ring metal resistors, and the main circuit uses five-ring metal film resistors with an accuracy of ±1% to ensure a good signal-to-noise ratio of the whole machine. 4, PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tinning process to ensure good passing performance of large and small currents. First-class PCB quality. 5, The biggest feature of this board is the use of the current advanced C1237 BTL speaker protection circuit, which effectively eliminates the impact sound of turning on and off and the DC output protection function, making your speakers safer. 6, The wiring layout of the whole circuit board is quite rigorous and reasonable, and the whole PCB wiring adopts one-point grounding method. The power amplifier board works stably and reliably, with large output power; the sound is beautiful and round, and the sound field is open. It has a strong stereo effect, stable and powerful low frequency, excellent signal-to-noise ratio, wide dynamic range; clear details, excellent transient response, and can play all kinds of music with ease, and has a very good performance in the home environment.
Specification
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1
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Power parameters: One set: DC+-(35V-55V) +-45V recommended (AC: transformer 300W double 32V, need to add rectifier board) The other group: single AC12V (note: each board is powered by a single AC12V power supply, that is, one board is powered by a single AC12V power supply)
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2
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Power: 300 watts (total harmonic distortion THD+N
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3
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Class A 90W, measured under 4 ohm load
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4
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Speaker impedance: 4-8 ohms.
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5
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PCB size: 59*236MM. Board size: length 236*width 95*height 30MM
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6
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First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistor so that the voltage at the two points C and D is 1.5-2V (that is, the voltage across the R9 (1K) resistor); at this time, the input differential current is 1.5- 2MA, this value is the best sound quality
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7
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The quiescent current of the large tube is 100MA: Adjust the adjustable resistor VR2 (1K) so that the voltage at A and B is 22MV, and the quiescent current I=22MV/0.22R resistance is 100MA; if the customer’s heat sink is large enough, it can make Increase the quiescent current, generally 100MA-300MA has the best sound effect.
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8
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A pair of symmetrical output and input
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9
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Big tube pairing
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Details Images