1pair Adjustable YJ-E405 Gold-sealed Tube Power Amplifier Board Class A 60W

Description

1pair Adjustable YJ-E405 Gold-sealed Tube Power Amplifier Board Class A
parameter:
1. Power supply: DC+-(35V-55V) +-45V recommended
Note: Each board is powered by AC12V power supply independently.
2. Power: 200 W (total harmonic distortion THD+N<0.1%), DC+-45V, 4
Ω
3. Class A 60W, measured under 4 ohm load
4. Speaker impedance: 4-8
Ω
5. Board size: 105*236mm
6. First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistor so that the voltage at the two 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 of 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. At this time, the quiescent current I=22MV/0.22R is 100MA; if the customer’s heat sink is large enough, it can make Increase quiescent current, generally 100MA-300MA sound effect
Introduction:
1. The inter-stage coupling capacitor adopts WIMA capacitor 1UF, the sound is natural and the sound field is wide.
2. The resistance uses five-ring metal 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.
3. The PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and the whole process of spraying tin to ensure the PCB quality with good performance of large and small currents.
4. The 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.
5. The wiring layout of the whole circuit board is quite rigorous and reasonable, and the whole PCB wiring adopts a point grounding method. The power amplifier board is stable and reliable, with large output power; beautiful and round sound, and open sound field. 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. It has a very good performance in the home sound environment.
Package:
2pcs Adjustable YJ-E405 Gold-sealed Tube Power Amplifier Board Class A
Payment Details
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Returns and Replacements
We accept returns and replacements within 30 days from the day the cutomer receive the products.Please make first contact within 30 days from receiving the order.Products should be returned in original condition.
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