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1Pair E405 300W amplifier board reference battery phase circuit power amplifier board A1943 / C5200 2SA1930 / 2SC5171
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parameter1. Power supply: DC + – (35V-55V) recommended + -45V and AC12V2. Power: 300 W (total harmonic distortion THD + N <0.1%), DC + -45 V, 4 ohms3. Class A 90W, measured under a 4 ohm load4. Speaker impedance: 4-8 ohms.5. PCB size: 59 * 236MM.6. Set the differential current of the input stage to 2MA: Set the adjustable resistor VR1 (500R) so that the voltage between C and D is 1.5-2 V (ie the voltage across resistor R9 (1K)); The input differential current is 1.5 to 2 mA. This value is the best sound quality7. The quiescent current of the large tube is 100MA: Set the adjustable resistor VR2 (1K) so that the voltage of the two points A and B is 22MV. At this point in time, the quiescent current I = 22MV / 0.22R is a resistance of 100 mA; If the customer's heat sink is large enough, it can increase the quiescent current. Typically, the 100MA-300MA tone effect is best.8. A pair of cards with symmetrical left and right entrances
properties1. Use the original Toshiba A1943 / C5200 and 2SA1930 / 2SC5171.2. The inter-stage coupling capacitor adopts WIMA top capacitor 1UF, and the main circuit of the electrolytic capacitor signal adopts imported Panasonic brand name to ensure strong and continuous power support.3. The resistor consists of a metal ring with five rings. The main circuit uses a metal film resistor with five rings and an accuracy of 1% to ensure a good signal-to-noise ratio.4. PCB adopts 1.6mm thick double-sided sheet, 2.0oz copper thickness, and spray tin full process to ensure good performance on large and small streams. First class printed circuit board quality.5. The biggest feature of this board is the use of the current advanced C1237 BTL speaker protection circuit, which effectively removes the impact and DC output protection of opening and shutdown, making your speaker safer.6. The layout of the entire circuit board is quite strict and reasonable, and the circuit board trace uses a grounding method. The power amplifier board works stably and reliably, and the output power is large; The sound is nice and round and the sound field is wide. The three-dimensional sense is strong, the low frequency is solid and solid, the signal-to-noise ratio is very good, the dynamic range is large, the details are clear, the transient response is excellent, and all kinds of music can be played comfortably. It performs very well in the family playback environment.
package1 pair of E405 tube power amplifier board 300W AMP A1943 / C5200 2SA1930 / 2SC5171
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Category: Sound and Vision:Home Audio and HiFi Separates:Amplifiers and Pre-Amps
Location: wuhan, 湖北省