One Pair of YJ E505 HiFi AMP Gold Sealed MJ15024G MJ15025G 2SA1930 2SC5171 Tube Power Amplifier Board

Description

• The wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB wiring adopts a single point grounding method. This power amplifier board works stably and reliably, with a high output power; The voice is beautiful and round, with a broad sound field. Strong three-dimensional sense, stable and solid low-frequency, excellent signal-to-noise ratio, and wide dynamic range; Clear details and excellent transient response, able to handle various types of music.
• Using original MJ15024G/MJ15025G and 2SA1930/2SC5171.
• The resistance adopts a five ring metal resistor, and the main circuit adopts a five ring metal film resistor with an accuracy of 1%, ensuring a good signal-to-noise ratio of the entire machine.
• Adopting the currently advanced C1237 BTL horn protection circuit, effectively eliminating the impact sound of turning on and off
• Power: 300W (total harmonic distortion THD+N < 0.1%), DC+-45V,4 .

Basic parameters:
1. Power parameters: a group: DC+- (35V-55V) recommended +-45V (AC: transformer 300W dual 32V, need to add rectifier plate).
Another group: single AC12V (Note: each board is powered independently by a single AC12V power supply, that is, a board is powered by a single AC12V power supply).
2. Power: 300W (total harmonic distortion THD+N <0.1%), DC+-45V,4 .
3. Class A 80W under 4 load.
4. Horn impedance: 4-8 ohms.
5. PCB size: 87*334MM.
Plate: 110W (including aluminum) * 334MM.
6. First, adjust the differential input current to 2MA: adjust the VR1 (500R) adjustable resistor so that the two-point voltage of VR1 D is 1.5-2V (that is, the voltage at both ends of the R9 (1K) resistor), and the input differential current is 1.5-2MA, which is of sound quality.
7. The static current of the tube is 100MA: adjust the adjustable resistor VR2 (1K) so that the voltage of An and B points is 22MV, then the static current I=22MV/0.22R resistance is 100MA; if the customer heatsink is large enough, it can increase the static current, general 100MA-300MA sound effect.
8. Weight: 0.6KG+0.6KG
Product details: Using original MJ15024G/MJ15025G and 2SA1930/2SC5171. The inter stage coupling capacitor adopts 1UF, with natural sound and a wide sound field The resistance adopts a five ring metal resistor, and the main circuit adopts a five ring metal film resistor with an accuracy of 1%, ensuring a good signal-to-noise ratio of the entire machine. The PCB is made of 1.6mm thick double-sided board, 2.0A thick copper, and gold-plated process to ensure good performance in passing large and small currents Adopting the currently advanced C1237 BTL horn protection circuit, effectively eliminating the impact sound of turning on and off DC output protection function makes your speaker safer.
Packaging: 1 pair of E505 gold sealed tube pure rear stage power amplifier board

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