Using old tube radio mechanism 6n1 + 6P14 electronic pipe power amplifier, 6N1 + 6P14 Vacuum Tube amplifier
Keywords: 6n1, 6p14, electronic pipe power discharge circuit
The author bought a spring-style SC-1 6 lamp two-wave section from the waste acquisition station, sang two-purpose electronic tube radio, such as the treasure. Because I thought I had a Taiwan biliary machine to listen to the radio, I didn't have to worry about it, as long as the repair and transformation became.
I took a few decades, I looked very shabby. First, wipe it off, pull the movement, wipe it fine with alcohol, and the lines and devices are not too old. Check the device, line, solder joint, no problem. This is a single-ended small ashmole, with a 6N1 1/2 of the electric pressure, and the other 1/2 is pushed. The power amplifier tube is 6P14, the output power is 5.4W, and the high and low tone control is very suitable for the room audio. .
Tongzhi test machine, the filament of each tube is normal, no fire phenomenon, the temperature of the power transformer is normal, that is, the point sound is not. In order to facilitate inspection, disconnect all lines from the front part from the detection. The line diagram (Figure) is drawn according to the actual object. R, C serial numbers are the author of the author, R, and C is the original label.
Because there is no sound, step first check the speaker. Use the battery test with a carame, indicating that the two speakers are good. The second step is measured in each voltage. The filament voltages are normal, measure the three DC high pressure output normal, 6N1 two screens are normal, 6p14 curtains, The gate negative pressure is normal. Only 6P14 screen is extremely high pressure, it is fixed to output the coil of the output transformer has a break, remove the output transformer to measure the primary coil, and don't do it, what should I do?
In order to test the amplifier, find a small transformer of the primary 220V secondary 6V instead of the output transformer, and the coil hits the input CD with a screwdriver, and there is a dangling sound in the speaker.
The production of output transformers is inevitable. The original output transformer is relatively small, and the cross-sectional area is only 14mm × 18 mm. Skills a broadcast of bad line transformers, 38mm tongue, 2 mm, thick 20mm, with it to create an output transformer.
In the amplifier production, you should get enough low bass components to get enough low bass components, requiring output transformers with sufficient amount of inductance, and sufficiently small distributed capacitance and magnetic magnetic sensing, in order to have good playback effect.
First, the skeleton of the output transformer coil is taken, divided into five sections, the primary and secondary coils form 3 + 2 structures. The primary coils account for three slots, with φ0.14mm enamel lines, 300, 3 wire tails, the secondary coils, the secondary coils, with φ0.68mm enamel lines around 60, two coil head A total of 120, secondary impedance 8Ω. After the immersion lacquer, after the lamination, the test is tested. The SONYSRF-H35 FM stereo radio is used as a sound source, and the 89.8MHz Baoding Frequency Channel will be used to listen to the radio and songs. Then adjust the high and low control, the sound is soft and sweet, and clearly sound. Insufficient beauty is a bit talking to the sand murmur that appears when the bass is hit.
Three aspects have been made, one is to convert the power filter decoupling capacitance, and the coupling capacitor is replaced by oil immersion, improve the performance of the capacitor, and reduce the leakage coefficient. The second is a 150p capacitance on the resistance of the negative feedback circuit R13 10kΩ to prevent the generated self-excitation. The third is to replace the power cord, signal line, and speaker lines into high-grade lines. Finally, I have a clean stator oil in the potential of the noise, eliminate the murmur, use HP3 as a source, the music that is released, and I am very happy. Author: Wang Senson
Our other product:
