Description:1. Using original 6J1 tube2. The main filter capacitor is imported from 470UF/25V, and the coupling capacitor is imported capacitor 1UF.3. The resistor uses - 1% metal resistor and a high-precision chip resistor to ensure a good signal-to-noise ratio.4. 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 and small currents.5. The input and output are gold-plated RCA, which is very durable.6. Bluetooth adopts QCC3003 Bluetooth 5.0Tips:
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