Classic production of a 5W megaphone, 6H6C amplifier

Classic production of a 5W megaphone, 6H6C amplifier Keywords: 6H6C, amplifier power discharge circuit diagram Author: 吉刚 This 5W megaphone circuit principle is shown below. The first stage of the megaphone is inverted, and is composed of a double triode 6H8C. The second stage is the push-pull power amplification stage, and two beam shot tube 6H6C is formed, and it is connected to a triode to operate in a matrix state. 6H8C is a medium-cross-guided and internal resistant tube, which is ideal for modern CD and other large dynamic signal sources, can be changed by domestic tube 6N8P or European tube 6SN7. 6N6C can be converted with domestic 6P6P and 6V6. If it is all converted to a small nine pedigree, 6H8C and 6N6C can be converted with 6N1 and 6P1, respectively. The entire flow pipe SU4C is exactly the same as domestic tube 524P, which can be directly replaced. The iron core of the power transformer is selected from the middle of the primary coil, the primary coil is used around 880, the secondary high pressure coil is used with φ0.23mm enameled wire by 2 × 1280, 5u4c tube filament windings with φL.LMM enamel wiring 20 turns, the filament windings of other tubes with φ1.5mm enamel wire by 25. Filtered inductive coil iron cores use S = 30 mm × 30 mm, with φ0.3mm enameled wire around 3500, leave air gap 0.2 mm to 0.3 mm. The output transformer terminal of this machine is relatively special, and the negative feedback voltage of the machine is obtained by the second cutting stage of the output transformer. The iron core of the output transformer is selected from the S = 19 mm × 40 mm, the number of turns of the coil and the line diameter are shown below. There is no volume control in this chair design, directly using the volume control of the signal source to control the volume, and of course, according to the needs of the individual, it is more convenient to use the volume control potentiometer. The adjustment is relatively easy. If self-excitement is negative, it is negative feedback to turn into positive feedback, and the output transformer should be adjusted at both ends of the second sub-winding of the output transformer. Read more

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