The single-ended Class A tube amplifier made with EL156 has low cost, small size, and output power of up to 25W. It is an ideal power tube.
The picture is the principle of the power amplifier circuit composed of 6n8P + EL156. All the parameters of this machine are marked on the figure, including the measured voltage at each point, etc., which is basically made according to the single-ended Class A amplifier data recommended by the manufacturer. The line of this machine is simple, as long as the enthusiasts can weld according to the picture, they can basically meet the requirements. The picture is a circuit of one channel, the other channel is exactly the same. This machine adopts two-stage amplification, the front stage uses 6N8P in parallel, and the power amplifier stage uses EL156 tubes to form a single-ended Class A amplifier circuit. Generally, the pre-stage includes two stages of pre-amplification and pushing to meet the driving requirements of the amplifier. However, EL156 is a high-transconductance, low-grid pressure tube, so the pre-stage and the driving stage can be combined into one stage. In Hi-Fi amplifiers, the fewer the amplification stages, the smaller the noise and distortion of the signal during the amplification process. The pre-amplifier 6N8P is a double-three-stage bile, which is connected in parallel. It can also be replaced with a "small head" such as 6N6 or other personal sound preference according to personal preferences, so that the whole machine is more visually personalized, of course The sound of the tube change will also change. In short, the bile amplifier is a personal thing, and the change of the timbre only needs to satisfy your own preferences.
The power part is relatively simple, the author no longer provides the schematic of the power part, this machine uses two high and low voltage power transformers, one low voltage transformer provides 6N8P and EL156 three sets of filament 6. 3V winding, the other high voltage transformer Provide a set of filament 5V windings of the rectifier tube 5Z8 and two sets of 450V / 0.2A high-voltage windings, which are then filtered by two inductors and supplied to the left and right channels respectively. Sufficient filament preheating has a positive effect on the life of the electron tube, so the low voltage switch must be turned on when the power is turned on, and the high voltage switch is turned on after the electron tube is fully preheated. The shutdown process is just the opposite.
The winding requirements of single-ended Class A amplifier output transformer are relatively high. The four transformers and the two power supply filter inductors on this machine are all wound by a professional factory in Shenzhen. The data and winding method are provided by the author. They use 4 clips, 3 layers and cross winding. Two of them use 96 # The output transformer made of silicon steel sheet meets the design requirements after testing various indicators, and the square wave test of low frequency, intermediate frequency and high frequency is also good.
Due to the small number of components, this machine adopts the "shack welding" process, C1, C2, C3 use the familiar red "WIMA", C4, C5 use metalized non-inductive polyester capacitors. About the wiring, structure and Debugging is described in detail in many articles, so I wo n’t go into details in this article. As long as the ground wire is routed properly, when the machine is working, the ears are close to the speaker and you ca n’t hear the hum. The author ’s “owners†are: one 24bit CD player, homemade 12-inch large box and a factory-made 8-inch Danish unit imitation bookshelf box. Connect the equipment to the sound test one by one, personal evaluation: 12-inch large box bass shock, "hammer to heart" The midrange and treble are balanced, real, and layered. The bass of the 8-inch bookshelf box is not exaggerated. The midrange and treble are clear and very comfortable. In short, you may hear more in this amplifier that you did not hear before, or did not hear clearly. Music details. As for more descriptions of sweet sounds, I will save them here, because my personal preferences are different. Maybe my favorite levels are clear and the balance of the sounds is what you do n’t really care about. So it's still for fans to copy, compare and evaluate by themselves after imitating! I believe the joy it brings to you can never be described by words.
1.6 years product warranty (material and workmanship), 25 years module power output warranty
2.Industry leading plus only power tolerance: 0+3%
3.Strong framed module, passing mechanical load test of 5400Pa to withstand heavier snow load 4.17% conversion efficiency,reducing installation costs and maximizing the kwh output per unit area.
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