This kind of single-ended output (dual-channel) gallbladder machine is really not cheap if it costs seven or eight thousand or even tens of thousands. As long as you have money, it doesn't matter to a lover who likes to listen to the courage machine.
However, people who play the courage machine don't have to spend this money. To play the courage machine, we must play the fun and fun made by the courage machine.
If you have hands-on ability, assemble it yourself. Of course, buying a ready-made courage machine looks beautiful, but it is meaningless. It is better to install one yourself, so that you can master the knowledge of electron tubes and improve your hobbies and interests. After the successful installation, there is a great sense of pride and accomplishment, and that kind of joy can not be expressed by money.
The beeping of the gallbladder machine changes with the change of volume, indicating that the output amplification part of the gallbladder machine power amplifier is intact, and the problem lies in the previous stage, that is, the voltage amplification circuit in front of the volume potentiometer is faulty.
First, the voltages at all levels of the front line are intact, and then the signal short-circuit method is used to test, that is, the signal grid of the audio input of the front line is short-circuited, to see if the beep still exists, and if it continues to exist, to measure whether the 0.0 1 microfarad coupling capacitor of the front line is broken down.