2pcs/set E405 Gold Seal Tube Post Grade Amplifier Board Class A High Power HIFI AMP Circuit Module 200W MJ15024G/MJ15025G/2SA19 |

2pcs/set E405 Gold Seal Tube Post Grade Amplifier Board Class A High Power HIFI AMP Circuit Module 200W MJ15024G/MJ15025G/2SA19 |

Basic parameters:

1. Power supply: DC+-(35V-55V) Recommended +-45V Note: Each board AC12V power supply independently.
2. Power: 200 W (Total Harmonic Distortion THD+N<0.1%), DC+-45V, 4 Euro
3. Class A 60W, 4 Euro measured
4. Speaker impedance: 4-8 Euro.
5. Board size: 105*236MM.
6. First adjust the differential input stage current to 2MA: Adjust the VR1 (500R) adjustable resistance so that the voltage at C and D is 1.5-2V (ie the voltage across the R9 (1K) resistor); the input differential current is 1.5- 2MA, this value is the best sound quality
7. Big tube quiescent current is 100MA: adjust the adjustable resistor VR2 (1K) so that the two points A and B voltage is 22MV, then the quiescent current I = 22MV/0.22R resistance is 100MA; if the customer heat sink is large enough, can make Increase the quiescent current, the best 100MA-300MA sound effects.
8. Weight: 0.5KG+0.5KG
 

Product Description:
   All parts of this product are original authentic, unadorned, pure quality; use of high-quality original parts, not only to ensure the safety and quality, long life, more importantly, to make the actual performance to achieve the design goals of a strong guarantee. The pursuit of quality is our consistent aim. The golden case E405 is an upgraded version of the E305. The E305 is a Diamond Diamond structure with a dual differential input to the FET. It has a very low crossover distortion. Unlike the E305, the E405 is a pure DC. The entire line does not have a coupling capacitor. No feedback capacitance, is a type of current negative feedback, with excellent dynamic response and depth of dive, the reference level of this line is pure after-class E405, with DC servo circuit (acted by OP07 with extremely low noise), Omron relay +C1237 Speaker protection protects your speakers; increased output over-current protection. E405 sound characteristics: natural and slender, wide voice, great dynamic effect is very good, the biggest feature is the bass deep dive.
product details:
n Using the original ON Semiconductor MJ15024G/MJ15025G and Toshiba 2SA1930/2SC5171.
N-stage coupling capacitor uses WIMA top capacitor 1UF, natural sound, wide sound field
n The resistor uses a five-ring metal resistor, and the main loop uses a five-ring metal film resistor with an accuracy of ±1% to ensure a good signal-to-noise ratio.
n PCB adopts 1.6mm thick double-sided plate, 2.0oz thick copper, and spray tin process to ensure good current performance. First-class PCB quality.
n The most important feature of this board is to use the current advanced C1237 BTL speaker protection circuit to effectively eliminate the impact sound and DC output protection function of opening and shutting down, making your speaker more secure.
n The layout of the entire circuit board is very rigorous and reasonable, and the overall PCB trace uses a point grounding method. The power amplifier board is stable and reliable, and has a large output power; the sound is mellow and the sound field is open. Strong sense of three-dimensional, low-frequency solid and powerful, signal-to-noise ratio is very good, wide dynamic range; clear details, excellent transient response, playing all kinds of music to cope with, in the family's playback environment has a very good performance.
n Price is the price of a pair of plates