1pc MOFI HIFI AN M7 Tube Pre-Amplifie PCB

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eBay 1pc MOFI HIFI AN M7 Tube Pre-Amplifie PCB Tech highlights Compared with the commonly reproduction of AN.M7, we improved: 1）、High Voltage：Two-stage buck regulator filter, Two low-pass filter (with a corner frequency of 1.6Hz&16Hz) prevents power noise from being introduced into the amplifier. Provide purer power supply (close to battery). 2）、The high-voltage power supply uses MOSFET as pass transistors, which have a sense of tube sound characteristics but rejecting the rectification and regulation noise. 3）、high-voltage soft-start feature is included which will take about 5 second to reach the designed voltage protecting the tube from any voltage shock. 4）、heater-voltage soft-start feature for vacuum heater is included which will take about 5 second to reach the designed voltage(12.6v) protecting the tube from any voltage shock and extending life. 5）、all-in-one design, single-point grounding, ground resistance is close to the 0.02 ohm resistance value, low noisedesign. 6）、PCB is Small with double-sided smt. 7）、Independent tubes for left and right channels to avoid two channels signal coupling, further improves the separation and reduces crosstalk. 8）、Mirror HR-pin, please shift two channels’ tubes every 6 month to avoid magnetization and extend tube life. Saving your money. Schematic & key point of debugging PCB comes with component parameters for easy installation. We only refer the schematic of the amplification part of the circuit. If you need full circuit parameter, please read the component value with the PCB by yourself; we do not provide additionally. please keep test point voltage close enough to it, +-20% is also permitted. Parts list Instructions Since the PCB holes are plated through, you only need to solder the parts from the bottom of the board. Do not drill or enlarge the holes because that would damage the through-plating. Clean both sides of the blank PCB with paper towel and isopropyl alcohol or electronics flux remover, then solder the components to the board, starting with the lowest profile parts. This means the resistors and zener diode. Then solder the small capacitors, small transistors, followed by the larger capacitors. Make sure the correct part goes into each position on the circuit board. Measure each resistor with your multimeter to ensure it’s the proper value. Pay attention to the polarity of electrolytic capacitors, diodes, , transistors as well as the orientation. Clean up the solder flux residue from the board with isopropyl alcohol (or electronics flux remover) and a brush. Inspect all solder connections carefully, using a magnifying glass, to make sure there are no solder bridges or cold solder joints. Use a multimeter in ohms scale to check for short circuits. Since each LT1085/LM317T’s mounting tab is internally connected to the pin2, it will carry live voltages and should not be shorted to the chassis, ground or other parts of the circuit. The K2700 are vulnerable to electrostatic discharge damage when you are handling them, so keep their pins plugged into anti-static foam while working with them until you’re ready to solder them to the board. Set the heatsinks pre-mounted with the K2700 aside for now. Pics Payment Method: PayPal preferred Shippment: 1.We provide free shipping to international via China Post Airmail or Hong Kong Post Airmail, and every parcel will be registered with tracking number. We can also ship by UPS/EMS/DHL/FedEx 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. 3.Time of Delivery:Based on the China Post Airmail or Hong Kong Post Airmail and our experience, kindly please be noted that To United States / United Kingdom / Australia, it takes around 10-15 business days; To Canada, it takes around 12-18 business days; To Brazil / South America, it takes around 25-35 business days. To Italy / France / Spain / Germany/ Eastern Europe, it takes aournd 15-20 business days. Returns & Replacements & Repair: We accept returns & replacements within 30 days from the day the customer receive the products, please make first contact within 30 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!

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