NEWest 2 PCS Accuphase-E505 5-pair tube pure high power 300W + 300W HIFI fever level power amplifier board (adjustable class A)

Product Description: 

   All parts of this product are original authentic, unpretentious, pure quality; the use of high-quality original parts is not only safe

The full quality is guaranteed, the service life is long, and more importantly, it is a strong guarantee that the actual performance can reach the design goal. Pursuit

Quality is our consistent aim. The Golden Throat E405 is an upgraded version of the E305, and the E305 also belongs to the FET double differential output of the FET

The incoming diamond diamond structure has extremely low crossover distortion. Unlike the E305, the E405 is pure DC, and the entire line has no

A coupling capacitor, without feedback capacitor, is a type of current negative feedback, with excellent dynamic response and dive depth,

This line refers to the pure final stage of Golden Throat E405, with DC servo circuit (used by OP07 with extremely low noise), Omron relay

+ C1237 speaker protection protects your speakers; add output overload and overcurrent protection.

E505 sound characteristics: natural and slender, wide sound, great dynamic effect is very good, the biggest feature is the extremely deep bass dive.

Product details:

1. Using original ON Semiconductor MJ15024G / MJ15025G and Toshiba 2SA1930 / 2SC5171.

2. Coupling capacitor uses WIMA top capacitor 1UF, natural sound, wide sound field

3. The resistance adopts five-ring metal resistance, and the main loop adopts five-ring metal film resistance with an accuracy of ± 1%, ensuring a good signal-to-noise ratio of the whole machine.

4. PCB adopts 1.6mm thick double-sided board, 2.0 ounce copper thickness, and full tin-spraying 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 switching on and off and the DC output protection function, making your speakers safer.

6. The wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB wiring adopts one-point grounding. The power amplifier board is stable and reliable, with large output power; the sound is beautiful and round, and the sound field is wide. Strong three-dimensional sense, low frequency is stable and powerful, the signal-to-noise ratio is quite excellent, the dynamic range is wide; the details are clear, the transient response is excellent, and all kinds of music can be played with ease, and it has a very good performance in the family's playback environment.

7. The price is the price of a pair of boards

Basic parameters:

1. Power supply parameters: one set: DC +-(35V-55V) recommended + -45V (AC: transformer 300W double 32V, need to add rectifier board)

   Another group: single AC12V (note: each board is powered independently by a single AC12V power supply, that is, one board is powered by a single AC12V power supply)

2. Power: 300 watts (total harmonic distortion THD + N <0.1%), DC + -45V, 3 ohms

3. Class 80W, measured under 3 Euro load

4. Speaker impedance: 4-8 Euro.

5. PCB size: 87 * 334MM.

  Board: 110 wide (including aluminum) * 334MM

6. First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistor so that the voltage at the two points of C and D is 1.5-2V (that is, the voltage across the R9 (1K) resistor); the input differential current is 1.5- 2MA, this value is the best sound quality

7. The static current of the large tube is 100MA: adjust the adjustable resistor VR2 (1K) so that the voltage at the two points of A and B is 22MV, then the static current I = 22MV / 0.22R resistance is 100MA; if the customer heat sink is large enough, it can Increase the static current, generally 100MA-300MA sound effect is best.

8. Weight:1.2 KG