One Pair 4B Gold Sealed Tube Pure Post-Class A Amplifier Board (90W+90W)

Description: One pair 4B Gold Sealed Tube Pure Post-Class A Amplifier Board (90W+90W)Product Detailsn Using original ON Semiconductor MJ15024G/MJ15025G and Toshiba MJE15034/MJE15035.n inter-stage coupling capacitor using two 47UF capacitors in series, natural sound, wide sound fieldn resistors using five-ring metal resistors, the main circuit using the accuracy of ± 1% of the five-ring metal film resistors, to ensure a good signal-to-noise ratio of the whole machine.n PCB using 1.6mm thick double-sided plate, 2.0 amps copper thickness, full board gold plating process, to ensure good performance of the size of the current through First-class PCB quality.n The entire circuit board alignment layout is quite rigorous and reasonable, the overall PCB alignment using a point grounding method. The amplifier board work stable and reliable, high output power; sound beautiful and round, the sound field is open. Strong sense of stereo, low-frequency stability and solid power, signal-to-noise ratio is quite excellent, wide dynamic range; clear details, excellent transient response, play a variety of music are coping with ease, in the family playback environment has a very good performance. Basic parameters1. power supply parameters: DC +-55V (AC: transformer 400W dual 40V, need to add rectifier board)2. power: Class A and B 350 watts (total harmonic distortion THD + N < 0.1%), DC +-55V 4 ohms, Class A 90W + 90W 8 ohms3. Class A 90W, measured at 8 ohms load4. speaker impedance: 4-8 ohms.5. Board size: 130(including angle aluminum)*270MM6. large tube quiescent current of 100MA: adjust adjustable resistor VR2 (1K) so that the voltage of the two points A and B for 22MV, at this time the quiescent current I = 22MV / 0.22R resistance that 100MA; if the customer heatsink is large enough, can make to increase the quiescent current, generally 100MA-300MA sound effect is the best.7. weight:0.6KG+0.6KGPackage：One Pair 4B Gold Sealed Tube Pure Post-Class A Amplifier Board (90W+90W) 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 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 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!

Price: 326.17 USD

Location: Wuhan

End Time: 2024-12-30T03:58:12.000Z

Shipping Cost: 10 USD