Superlinear single-ended, up-end, ---- 6P14 Vacuum Tube Amplifier

Tube amp sounds sweet, although a small number of output power, still favored by those who play with guts! Two common three-channel native peanut tube circuit shown in Figure 1. Low-noise input stage high μ double triode 12AX7, much lower than the noise factor of 6N2 the like, to improve the overall signal to noise ratio is very important. At first glance circuits and 1960s a variety of popular brands of similar tube radio, a careful analysis is different. One is to increase the input stage and the amplifier stage coupling capacitor coupling capacitance of the capacitor, so that the machine can improve low-frequency response. If you use a MKP capacitor. Soft sound of sound quality. Second stage amplifier circuit uses the ultra-linear, low output impedance, small nonlinear distortion, large output power. Ultra linear circuit is common in push-pull output amplifier in the bladder, but in the single-ended output amplifier is very rare. In fact, this circuit is a negative feedback circuit of the screen grid, a screen grid primary taps between the appropriate output turns cattle, taps and model of the power amplifier used in a very close relationship. This experiment should be repeated, at the time of 42% of the total number of turns of the primary, the minimum distortion. The power supply circuit outputs a single-ended tube amp critical rounding bulky filter inductance used in the form of active filtering and increase capacity electrolytic capacitors, the high back pressure power tube, to provide a stable very small ripple power, the hum to a minimum. The cow is critical machine output devices. High quality silicon steel core, the cross-sectional area of ​​19mm × 28mm (20W), the primary winding enameled wire with high Φ0.17mm 3000 turns, 1260 turns the tap. The secondary winding 90 turns with Φ0.82mm enameled wire. Early / secondary impedance ratio 5.2kΩ: 4Ω. In order to reduce the leakage, it is sandwiched by segmentation layering. Divided into two groups of primary, secondary divided into three groups. The primary winding interposed in the secondary winding, the core leaving 0.1mm air gap. In order to reduce noise and improve the signal to noise ratio between the input socket to the application quality shielded wire W, preferably Gl plus shield against outside interference clutter. FIG 2 is a bile pinout FIG. Jiangsu Fu Man Lou mouth

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