Keywords: 6N5P, amplifier circuit diagram
I love the audio, and more than 100 amps have been created in more than 40 years. After decades of long-term listening comparisons, the most satisfied, the price is the highest price or 6N5P, push-pull without rebelling machine. The machine has excellent technical performance, and it is necessary to introduce it to the enthusiasts here.
First, circuit structure
The principle of this installment circuit is shown in Figure 1, and the figure is a channel of a channel, and the other is exactly the same. The input voltage amplification of the input voltage is constituted by V1, and V2 constitutes inverted push level, V3, and V4 constitutes a push-pull output stage.
Since the pre-output input eight voltage amplifier is decisive to the signal-to-noise ratio indicator of the whole machine, the quality of V1 is very important. To this end, this is taken by 6N11 fever. This stage is in the form of classic triode amplification, reliable work, simple line, and more sound.
The promotion grade uses a 6n6 cathode crack-like circuit: Under amateur conditions, the common cathode cracking circuit is easily obtained to obtain a positive and negative signal equal to the amplitude. The level is essential, and it has laid the foundation for the power level in low distortion and high efficiency.
The output stage was held by 6N5P, which is low in internal resistance, large current double tripod. Practice has proven that it is very good to use it as an audio power. The power amplifier output stage uses a two-bias circuit structure, which can improve the stability of the circuit, but also adjust the working state of the last level amplifier in the heart (the discrete is large, it is difficult to achieve the most Best state)
Second, welding debugging
The whole machine welding is completed, do not insert the power amplifier, then adjust the negative voltage to 90V, turn off the negative voltage, and then plug in all electron tube power resistance, and 6N5P cathodic resistance should be 14V. At this time, the current is 46mA, and about 92mA per tube is normal. When the screen pressure is 240V, the power dissipation power is 22W (maximum 26W), close to the limit value, and the practice proves that this state is safe and reliable, linear is good. I have been successfully built in 1995 in 1995, and I have no fault in the day, and there is no fault, and the sound effect is getting perfect.
The power circuit is shown in Figure 2. The power cow is sufficient, and the secondary high voltage current is not less than 600mA. The high-pressure filter resistance uses an aluminum shell resistor, 50 Ω / 50 W × 4, and the total amount of filter capacitance is used to 1000 μF, and the filtering of the transistor machine is filtered.
In order to ensure the quality of the whole machine, the output cattle is best purchased from professional manufacturers. I am from Hebei mail order, the cattle real material, quality flow.
Third, listening evaluation
Equipment match. CD machine. CE CZL100, Audio Decoder: New Detk DAC-3, Front Level: Homemade 3A5 Decang and 6V6 Pre-Level. Speaker: Danish Zunbao 307 and Hewei D6B. The signal line speaker cable is Longyu.
The noise after the start is very low, the ear is attached to the speaker mouth slightly "Shasha" (from the foreigner, the pre-schedule and not booting), put a familiar music, cool like "Guifeng" machine. Interested enthusiasts may try it, it will never be disappointed, and after comparing all kinds of Chinese and foreign cranes, they know its charm.
Author: Shimao
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