The small power amplifier (in fact, the volume is not small) uses the tube 3A5 as the front-stage voltage amplification, and promotes the 6P14 as the power output. 6P14 on the sound quality is unmatched by most power tubes, only the output power is slightly smaller. Because the parameters of the same kind of pipes are quite different, they should be matched when used. The selection of each component used in Figure 1 has been strictly tested and repeatedly adjusted by the author. It should not be easily changed, otherwise it may affect the sound quality. The power transformer and output transformer use Guangxi Yulin "Baoerzhen" brand products. The model of the power transformer is 80WB, and the output transformer is 6.5 watts. It is best to test and match at the time of purchase. The filter electrolytic capacitor is a Philips blue hexagonal electrolytic capacitor with a capacity of 100 μF to 220 μF. The oil-immersed capacitors are American tank-filled oil-immersed capacitors with a capacity of around 20 μF, and the front stage is slightly smaller at 8 μF. CBB capacitors are American APC or EC film capacitors, and resistors are American DALE military resistors or domestic red metal film resistors. The amplifier circuit is not complicated, and the negative feedback applied is relatively shallow. It has worked hard in the power supply circuit to ensure the quality of sound reproduction.
The speaker adopts a 6.5-inch bookshelf box, and the box body is made of wooden products. The front baffle is preferably tilted to facilitate the diffusion of sound, so that the sound of the sound can be wrapped around the beam as if the speaker does not exist. The tweeter uses Hivi SS1.11 silk film dome tweeter, and the mid-bass uses Danish VIFA (Weifa) model C17WG-69-08 sponge-edge glued paper cone speaker. The divider is self-made, see figure 2. The treble crossover capacitor is mixed with French Sauron (sweet and delicate sound) and German ERO (sound beautiful), and the middle and low impedance correction capacitors can be ordinary film capacitors. The inductor coil is a finished product of oxygen-free copper wire winding. The speaker consisting of these two speakers and the two-way crossover has a beautiful and transparent sound, rich details and excellent music listening.
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