Recently, there is no foreign holiday, and I have a lot of time to have a burn addiction. I have made a buffer (buffer level), and the slow fire is a few days. The sound is more beautiful than one day, I feel very worthy of fever readers and share it. a bit. This buffer-level line is used as a triode Class Class Class Class Class Class Class Class Class Class Class A, as shown in FIG. I think its tone is better than the Buffer of Marantz 7, but MARANTZ 7 uses only half of the electronic pipe, and this route is used with one 12AU7, and works around. The input stage is connected to the first gate of 12au 7 with a metal film capacitor, which is electrically connected to the second gate of 12AU7 to the second gate of 12AU7, so that the second set of TRIODE has become the superior current automatic adjustment system. The output is taken from the first set of cathodes and the second set of screens, and then one 2.2μFPP capacitance is connected to the output socket. The setting of the resistor R5 is that the entire line device is operated in the class A, even if there is no signal or small signal input, there is a fixed screen through, so that the sound is smooth and sweet, warm and natural.
In the early morning, the clerk introduced a Beijing Electronic Pipe factory in the 60 to 70s of the steel bones, the old new pipe 12AU7, using the eye, seeing the interior hand, including pole, foot, filament welding and mercury Electroplating has a sense of crafts, the price is very cheap, and there is a test pairing service. I bought 3 people. One will be used for another production; 12AU7 plus 12bz7 plus room boost transformer plus 211 SINRLE-EndedDirectheatingTriode post-horizontal designer, I hope to have the opportunity to share with you after the completion. The high pressure of the buffer stage has a buck value of about 250 V, and the filament is powered by DC, as shown in FIG.
Test machine
The final test machine, the equipment part of the test is my own; the combination is to push the passive four-layer resistor with the resolution quantum push the front level, push the battery power supply electronic sputum, and pure the pure Class A of the three half-cell power supply. The post-stage direct drive speaker, there is no traditional LC sputum in the sound box, and the sound is calculated on average. Meloke the buffer pick-up decoder and the pre-frequencies of the buffer after welding, and the high-frequency components are not enough. Then, the buffer is used for a tuner for 48 hours, and the output is connected to the 47kΩ fake load. Among the two days later, first, first, the first Steel Association "," Schindler'sList "Sixth" and twelve paragraphs, trial people's singular chorus, Evita's "lament" trial front female voice and guitar , Engelbert tries to make a man ... and try again, it is not a test machine, but to entertain music, it is really invested in music, although not the music played, it is really in the middle! It is already very Good equipment, plus the performance of the electronic tube buffer, my resolution quantum plus a complete combination, it has never been so good! Don't stop playing, the more you play, the more you have a stop, you will be afraid to play. Finished. I will have two upgrades: 1. High pressure is changed from π-shaped to 6x4 electronic pipe rectification. Second, put on a better tube, amperex 12au, RCA head, Mullard, how is Mullard? The sound can be more transparent, more beautiful?
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