6N1 Electronic Tube Differences Poplifting 6P3P Amplifier Production, 6N1 + 6P3P Power Amplifier
Keywords: 6N1, 6N6, 6P3P, electronic pipe power discharge circuit
Author: Liu Zhongshi
The author is a welder fan, from the 1950s, the ore radio begins, from not interrupted. In 1997, the electronic management power was assembled. It has set up several circuits. It always feels that the sound quality is not very ideal. After continuous selection, improvement, and installment, the line diagram of Figure L is summarized. I think that the electronic pipe amplifier is sweet, the sound quality is mellow, the sound is thick, the bottom rhyme is full, the parts are economical, the test is easy, and it is very easy to succeed.
The circuit consists of "differential amplification" + "voltage" + "final power amplification", and the whole machine is a fully symmetrical amplifying circuit. The ambulance ratio is high, the distortion is small, the sensitivity and gain is relatively high, the volume is strong, the elasticity is good, the final stage of the power amplifier does not use the currently used triodes and superlinear picks, but the traditional approach, for It has enough space to protect the output power, and there is enough space for negative feedback adjustment.
First, component selection 1. Resistance is divided by the power, and the 2W metal film resistance is selected. Grid leakage resistor, screen load resistance, cathode resistor measuring the resistance at the time of digital three-use table, requires each channel symmetry and the error is as small as possible, preferably equal. I am using the "big red robes" resistance.
2. Coupled capacitors Select CB8 type, withstand voltage of 630V. Each channel is symmetrical and the two capacitor capacity errors are as small as possible.
3. Power transformers homemade or purchase. I am homemade, rated power ≥ 250W.
4. Output transformer homemade or purchase. I am using the "Radio" magazine advertising column of the Yongnian County Golden Voice 50W push-pull output cattle. Enter the impedance 6.5kΩ. Output 15h anti-4Ω-8Ω-16Ω. Pressure LKV, price economy. It is not easy to use.
Second, installation is convenient to make it, design and produce a printed circuit board, as shown in Figure 2, readers can be imitated, or a shed welding can also be used.
The printed plate can be secured to the chassis, or it can be separated from the dashed line interrupt to suit the installation needs of different layouts. In addition to welded parts soldered on printed circuit boards, the components of the rectifier filtering portion can be placed adjacent to the transformer after fixing. The grounding wire is a grounding method with a ground bus and a housing. The signal input line uses the outer table with the shielded line of the insulating layer. The shield is grounded. The other end is empty and processed, and short circuits must not occur. The negative feedback lead is not welded, and then welded when the retained trial.
Third, debug 1. Adjust the W2 resistance to L / 2.
2. Check the drawings, carefully review each part, the joint is 焊, leak welding and soldering. After checking the false load or speaker, energized. All ministers have no fire, smoke, and measure the rectified output voltage of + 430V. The regulator portion is +300V, and -100V is at -VC. Adjust W3, W4. The grid negative pressure is all -60V shutdown.
3. Plug in all tubes and preheat the voltage stabilization. The measuring W2 midpoint voltage is around -3.5V, and the V2 cathode voltage is around -7.5V. Adjust the -C1, -C2 voltage. Make V3, V4 tube cathode voltage is 0.4V. At this time, the two tube cathode voltages differ more, and the tube that can be replaced and try again, the smaller the error, the smaller the error.
4. Open the volume potentiometer max. Use the ear close to the speaker. Carefully adjust W2 to minimize the noise of the speaker. The native this noise is extremely small.
5. Connect a negative feedback lead. Use a man to take a look at the joint. If you have a whistle, you can use the output bovine secondary ground line and feedback line. At this time, I listened to the bottom noise sent by the speaker, almost like not booting. 6. The volume is adjusted to the moderate position and adjust the resistance of R3. You will surprise. The sound effect changes in the adjustment, listening to the change of sound quality until you are satisfied. This feedback resistor can be arbitrarily selected from 3kΩ ~ L0KΩ, and C1 is not available.
7. This unit is equipped with a manual high pressure delay switch K, the delay time is generally around 20 seconds. There is a suspicion. Refer to methods described in other books. Increase the automatic delay function.
This machine has been equipped in 2003 to this day. Stable performance, sound quality is resistant. Welding facilities with a certain hand ability may wish to try.
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