Single-ended as a single-ended as a low-ended as a small size made of EL156 is small, the output power is 25W is a very ideal power tube.
The drawings are the principle of power amplifier circuit composed of 6N8P + EL156. All parameters of the author are marked on the map, including each point measurement voltage, etc., basically, according to the manufacturer's recommended single-ended amplifier data. This machine is concise, and the enthusiasts can basically meet the requirements as long as the welding is not missed. The figure is a channel, and the other is exactly the same. This machine uses two levels of magnification, with 6N8P in front-level, and the power amplifier grade EL156 tube forms a single-ended amplifier circuit. Typically the preamps include preamplification and pushing two levels to meet the promotion requirements of the work. However, the EL156 is a high cross guide, the low gate pressure tube, so the pre-level and the promotion grade are the first level. In Hi-Fi amplifier, the fewer magnifications, the smaller the noise in the amplification process, the smaller the distortion. The pre-magnifying tube 6N8P is two-level gallbladder. It uses parallelism, or it can be replaced with a 6n6 "small head" according to personal preferences, or other personal tone pre-tubes, which makes the whole machine more distinctive personality, of course Changed tones will also change, in short, the courage is a personality, and the change in tone will only meet your preferences.
The power supply is relatively simple. The author no longer provides the schematic of the power part. This machine uses two power transformers high and low pressure. One low voltage transformer provides three sets of 6N8P and EL156 of the three sets of lights 6. 3V windings, another high voltage transformer A set of filaments 5V windings and two sets of 450V / 0.2A high-pressure windings are provided, and then the left and right channels are supplied from two inductance filters. Sufficient filaments have a positive effect on the life of the tube, so when booting, the low-pressure switch is turned off, and the electronic pipe is completely preheated and then the high voltage switch is opened, the shutdown process is just the opposite.
The winding requirements of the single-ended amphoteric output transformer are relatively high. The 4 transformers and 2 power filter in this machine are bypass in Shenzhen, a professional factory, and the data is provided by the author. It uses 4 fold 3 hierarchical, cross-winding, two use 96 # The output transformer produced by silicon steel sheets, the test requirements, low frequency, intermediate frequency, and high frequency square wave tests are also good.
Since there are very few components, this machine adopts the "hand welding" process, C1, C2, and C3 adopt a more familiar red "WiMA ', C4, C5, unhappy polyester capacitance. About the wiring, structure, and Debugging has a detailed introduction in many articles. This article is no longer narrative. As long as the ground line is reasonable, the machine works, the ear is close to the speaker can't hear communication. The author's listening "home" is: one 24bit CD, homemade 12-inch big box and a plant use 8-inch Danish unit imitation bookshelf box. Pick the equipment one by one, personal evaluation: 1 2 inches big box bass shock, "hammer hammer" Hierarchy, truth, hierarchy, 8-inch bookshelf bass does not exaggerate Chinese rules, medium and high, clear, very comfortable. In short, you may hear more you didn't hear it in this amplifier, or didn't listen clearly Music details. As for more descriptions about sweet sounds here, because personal preferences are different, maybe I love the level, the sound balance is not very interested, then more "bragging"! So or hobbies After imitation, go to audition, comparison, evaluation! I believe it can be described by you.
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