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    Bile duct FD422 production 2 × 12W A single-ended amplifier ----- FD422 Vacuum Tube Amplifier

     

    I choose FD422 tube (FU7 a straight tube type heat) produced a single-ended Class A amplifier, together with sensitivity of 91dB speaker, sound extraordinary. FIG mono circuit, the other same channel. With pre-6J1 tube amplifier tubes dawn FD422, possess similar Nanjing FD422, FU25, imports possession 2E22,2P22 and so on. FD422 parameters filament 6. 3? 0. 9A, the maximum anode voltage 750V (screen flow 55mA), screen consumption 40W, CPI estimate the maximum output power of 40W × 1/3, about 13.3W screen according to consumption. Output transformer selection Changsha Melody electronics factory products, model 3. 5k / 30A, frequency response is 20Hz ~ 54kHz. Power transformer capacity greater than 180VA, plus shield. Domestic aluminum electrolysis days old brand, the coupling capacitor with oil capacitors. Welder completed the adjusted burn, repeated several times come to success.

     

     

     

     

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