The tube is based on the power amplifier circuit of NE5532

Shunluo Inductance Power Inductor SWPA Series First Class Agent

ESD electrostatic protection tube 5V two-way 0201

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

As shown in the figure, the schematic diagram of the tube power amplifier circuit driven by the NE5532. With the emergence and popularity of VCD machines, amplifiers are increasingly favored by audio enthusiasts. This article introduces a tube amp powered by the op amp NE5532, the sound quality is quite good. The power amplifier tube adopts Dawning 6P3PJ class beam quadrupole tube, and the output power is about 7W, which can meet the requirements of general family listening music. The circuit is very simple, as long as the welding is correct, it can work without debugging. The 6.3V voltage of the filament is obtained by the LM317T voltage regulation, and can also be connected to the constant current source circuit as shown in the figure. The constant current source circuit is beneficial to extend the life of the filament, but the height is slightly troublesome, and the R is about 1.5 ohms. When manufacturing, the coupling capacitor must use high-quality CBB capacitor or tantalum electrolytic capacitor. The resistor is 0.25W metal film resistor except for the specified power.