198 In stock
Finished PCBA Amplifier Board
IWISTAO Tube Headphone Amplifier Class A Finished Board 6N3 and 6Z4 Rectifier Lehmann Circuit
Model No: WETVBA-LM6N3
This headphone amplifier finished board is designed to refer to Lehmann circuit which music performance is unquestionable. It adopts 6N3 tube plus cross coupling follower and the whole board works in class-A working state to set up the current of power is exceeds 40MA. The music performance of the unit is very good.
1. The preamplifier stage of the board is amplified by tube 6N3 and tube 6Z4 as a rectifier, and the power stage adopts Lehman headphone amplifier drive circuit! Using a tube for rectification, its sound is sweeter and smoother than the ordinary rectifier generally.
2. Uses original Toshiba BD139/BD140 and tube 6N3 tube and 6Z4.
3. The coupling capacitor adopts the top German imported Weimar capacitor. the electrolytic capacitor of the main signal circuit adopts brand Nichicon one. The main filter capacitor adopts 2pcs the gold word capacity NOVER10000UF/35V and the imported chemical 290UF/450V. And use LM317/LM337 regulator circuit to ensure a strong and continuous power support.
4. The resistor uses a five-ring 1% metal resistor to ensure a good signal-to-noise ratio.
5. First-class PCB quality. The PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and the whole process of tin-spraying ensures the good passing performance of the current.
6. The power amplifier board is reasonable and beautiful.
1. Transformer operating voltage requirements:
a) AC15V-0-15V (10W)
b) High voltage: AC150V-0-150V (10MA or more)
c) Filament voltage: AC6V (4A)
2. Applicable headphone impedance: 32 ohms - 600 ohms
3. Frequency response: 20HZ-20KHZ
4. PCB size: 140mm*140mm
1.Important: Import duties, taxes and other customs related charges all are not included into shipping cost . Buyers bear all responsibility for all extra charges incurred (if any).
2. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address. We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
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You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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1. One year Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.2. Defective items MUST BE reported and returned within the warranty period (with the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN EXPIRED WARRANTY. You agree to all of the above-listed policies upon ordering on our store.