1, the frequency divider in the sound box is reformed, and the frequency divider inductance is replaced by the air-core inductance wound with enameled wire above 1mm, and the frequency divider capacitance is replaced by the non-inductive capacitance dedicated for audio. If possible, the speaker can be equipped with an enhanced _, or even a higher-grade speaker.

2. Motor power amplifier, increase the power of power transformer, improve the current of rectifier diode, increase the capacity of power filter capacitor, replace audio coupling capacitor with non-inductive capacitor dedicated for audio, and replace operational amplifier with NE5532 (the price is appropriate). If conditions permit, you can also use a higher level operational amplifier. You can also choose Toshiba (warm sound) or Sanken (cold sound) to replace the non-grade power amplifier tube according to your personal preference.

3. The sound source is very important. If you want high sound quality, you must have a good CD player. Ordinary CD players need a motorcycle (usually with a low-pass filter). If you use a computer as the sound source, you need a good sound card (at least 200 RMB), not ordinary MP3, but lossless format. Of course, there are many good audio sources to choose from, such as blue light and so on.