2pcs KSA100 Gold Sealed Tube HIFI Fever Adjustable Class A Power Amplifier Board

Description: 2pcs KSA100 Gold Sealed Tube HIFI Fever Adjustable Class A Power Amplifier Board Product Details:Using original ON Semiconductor MJ15024G/MJ15025G and Toshiba A1930/C5171.The interstage coupling capacitor adopts WIMA capacitor 1UF, the sound is natural and the sound field is wideThe five-ring metal film resistor with an accuracy of ±1% is selected as the resistor, which ensures a good signal-to-noise ratio of the whole machine.PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thick spray tin full process, to ensure large and small currentgood pass performance. PCB quality.This board is characterized by the use of advanced speaker protection circuit, effectively eliminating the impact of opening and closingAcoustic and DC output protection functions make your speakers safer. Input voltage: positive and negative 30V-50V DC, AC single 12V-15V (one group alone, two groups of two channels). +-45V is recommendedOutput power: Class A 100W+100W undistorted power, Class A and B is 350W+350W undistorted power output.Output impedance: 4-8 ohmsSingle board size: 271*121*40mm (with radiator)Single block weight: 0.65KG Debug steps:1. Static current adjustment: After welding, install the heat sink (note that the insulation between the tube and the heat sink should be done well), adjust the VR2 (5K) precision adjustable resistance so that the A/B points on the board (located on the upper left of the board) Angle) voltage is 22mV, at this time the quiescent current is 100mA/tube (22mV divided by 0R22 resistance), adjust the quiescent current counterclockwise to increase, and clockwise to decrease the quiescent currentThe original board of KSA100 MKⅡ is designed to be Class A 100W, and the quiescent current is adjusted to about 550MA (that is, the voltage of the two points of A/B in this line is adjusted to about 120mV). Class A working state; Note: In addition to a large enough heat sink, the power of the transformer should be large enough for Class A power amplifiers. The filter capacitor should be at least 20,000 microfarads for one channel. It is recommended to use 40,000 microfarads for one channel. Due to the excessive current consumption of Class A, insufficient power supply and filter capacitor capacity, the distortion will increase! Adjusting to class AB (200mA) sound quality is also a good choice 2. Midpoint voltage adjustment: adjust VR1 (5K) tightly adjustable resistance so that the output (OUT) to ground (ie both ends of the power amplifier output terminal) is zero millivolt; counterclockwise midpoint voltage decreases, clockwise increasesPackage:2pc KSA100 Amplifier Board Payment Method: PayPal preferred Shippment: 1.We provide free shipping to international via China Post Airmail,and every parcel will be registered with tracking number.We can also ship by EMS/DHL/FedEx/Aramex for alternative shipping method for corresponding fees. Please let us know before payment if you need split shipment. 2.International shipping requires complicated shipping procedures (such as both countries customs, transit stations etc.), also will be affected by many factors, such as holidays, weather conditions etc, If you have not received your shipment within 30 days from payment, please contact us. Returns & Replacements & Repair We accept returns & replacements within 14 days from the day the customer receive the products, please make first contact within 14 days from receiving the order. Products should be returned in original condition. As a benefit to our customers, we also provide repair within 3 months from the day when this item is shipped out, after repair is done, we will send you the item, but the customer should pay both shipping ways. Feedback : 1)Your 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 !! 2)We always offer the lowest price for best goods and service to you. 3) Please contact us before leaving neutral(3 stars) or negative(1-2 stars) feedback.We will try our best to solve the problem and leave you a happy shopping mood here. Thank you!

Price: 321.83 USD

Location: wuhan, 湖北省

End Time: 2025-01-06T07:45:55.000Z

Shipping Cost: 10 USD