1. The load (speaker) should be connected before the power is turned on. Don't send the signal without connecting the load or the load is short-circuited after the power is turned on.
2. Do not use the power supply too high or too low. The power supply voltage should preferably be within 5% of the specified voltage. It is best to use AC stabilized power supply if the power supply often exceeds this voltage value during use.
3. The temperature of the amplifier is high when it is working, so please pay attention to ventilation and heat dissipation.
4. Do not spill liquid on the tube during startup or within a period of time (within 30 minutes) just after shutdown. Generally, pay attention to the above-mentioned problems during use. The tube amplifier can work reliably.
