One Pair KSA80 Field Effect Tube Class A Power Amplifier Board J162 K1058. Use original J162/K1058 field effect tube bile taste tube, MJE15032/MJE15033, MJE340/MJE350. Coupling inter-stage capacitor adopts German imported WIMA capacitor 2.2UF, with natural sound and wide sound field.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. PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tinning process to ensure good passing performance of large and small currents. This board uses the current advanced C1237 speaker protection circuit, which effectively eliminates the impact sound of turning on and off and the DC output protection function, making your speakers safer. Power supply parameters: one set: DC +-40V (AC: transformer 300W double 28V, need to add rectifier board). The other group: single AC15V (note: each board is independently powered by a single AC15V power supply, that is, one board is powered by a single AC15V power supply).
The power amplifier board can use master-slave integrated power supply. When the master-slave integrated power supply is used, each channel uses 26-28V voltage and 6-8A current. The official recommendation is DC 70V, so our maximum working voltage does not exceed 80V, that is, plus or minus 40V. That is, the transformer outputs 26-28V AC.When the master and slave are powered separately, the current amplification part adopts 26-28V, and the voltage amplification adopts 26 to 30V transformer voltage. Class A 80W, measured under 4 ohm load. This circuit is easy to debug, just adjust the quiescent current, string a multimeter on the positive pole, set the multimeter to the 10A or 20A position, and adjust the potentiometer VR1 clockwise to adjust the current to 1.5A. There is no temperature on this board. Drift, no need to repeatedly adjust, this adjustment is based on the recommended radiator size adjustment parameters in this article. If the radiator is too large or too small, the adjustment will be changed. If the radiator is relatively large, the maximum quiescent current should not exceed 2A. If the radiator is too small, the temperature of the radiator should not exceed 60 degrees. When any point is reached, the quiescent current must be reduced to ensure safety. Radiator requirements: 350 X 150 X 50 length.
Tooth height recommended above 2KG. The size of the board with the radiator: 328120MM.1pc One Pair KSA80 Field Effect Tube Class A Power Amplifier Board J162 K1058. Feedback: 1Your Feedback is really important to us, please take a few seconds to leave great feedback if you are satisfied with our product or service, thank you so much! 2We always offer the lowest price for best goods and service to you. We will try our best to solve the problem and leave you a happy shopping mood here. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "eama0910" and is located in this country: CN. This item can be shipped worldwide.