E505 rear stage power amplifier board adjustable Class A high HIFI fever (1 pair) | Электроника

E505 rear stage power amplifier board adjustable Class A high HIFI fever (1 pair) | Электроника

Golden Throat E405 is an upgraded version of E305, which belongs to the field effect tube FET double differential output.

The diamond-shaped structure of the input has extremely low crossover distortion. Unlike the E305, the E405 is a pure DC. The entire line does not have a coupling capacitor or a feedback capacitor. It is a current negative feedback type with excellent dynamic response and down Dive depth

This line refers to the pure rear stage of Golden Voice E405, with DC servo circuit (played by OP07 with extremely low noise), Omron relay + C1237 speaker protection to escort your speakers; increased output overload and overcurrent protection.

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

Product details:

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

2: Inter-stage coupling capacitor adopts WIMA top-level capacitor 1UF, with natural sound and wide sound field

3: Five-ring metal resistance is used for the resistance, and the main circuit adopts a five-ring metal film resistor with an accuracy of ±1%, which ensures 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 tin spraying process to ensure good passing performance of large and small currents

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.

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

Parameters:

1. 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)

2. Power: 300 watts (total harmonic distortion THD+N<0.1%), DC+-45V, 4 ohms

3. Class A 80W, measured under 4 ohm load

4. Speaker impedance: 4-8 ohms.

5. PCB size: 87*334MM, board: 110 width (including aluminum) *334MM

6. First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistor so that the voltage at 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

7. 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.

8. Weight: 0.6KG+0.6KG