Description

Reference Marantz 7 Circuit PRT07B Tube Preamp/Vacuum Tube Phono Amplifier Tube Preamp Finished Board Note: This is a pair of ready boards and tested, not include tubes and transformers。recommend the use of electronic tube: 12AX7 and its compatible tube PCB size: 152*177*1.6 MM FR4 class A board (M7) Pre-gallen level, the sound quality is known for its mellow, medium frequency sweet and natural, and bold. The circuit of this work is derived from the classic M7 circuit, and the necessary modification and calibration according to the characteristics of modern devices (especially coupling capacitors) and old capacitors; Many people in the pre-gallen level are very easy to make, but the noise can not be eliminated is very loud. The reasonable layout and routing of this product, a little grounding, this product makes no annoying noise, very quiet. Input voltage: high voltage group: AC200-220V, not less than 15MA. Filament group: AC12-14V group, not less than 0.8A (for filament) This version uses DC filament power supply. When the filament supply voltage is too high, the heat sink will be very hot. Package: 1pc PRT07B Tube Preamp/Vacuum Tube Phono Amplifier Tube Preamp Finished Board Payment Method: PayPal preferred Shippment: We provide free shipping to international via China Post Airmail. We can also ship by TNT/EMS/DHL/FedEx for alternative shipping method for corresponding fees. Please let us know before payment if you need split shipment. 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: 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!