7. EA13 Usage Precautions

Chassis Heating and Heat Dissipation

1. It is normal for internal component heat to transfer to the enclosure surface during operation. The unit’s temperature rise meets safety and national‑standard requirements. The enclosure surface can reach high temperatures; do not touch hot areas to avoid burns.

2. Do not block ventilation openings. Place the unit in a well‑ventilated location. Excessive internal heat may cause malfunctions or even fire hazards.

Load Requirements

1. Always operate the amplifier with a valid load connected. Do not hot‑plug, hot‑swap or disconnect loads while an input signal is present.

2. Never short‑circuit the output terminals; this may damage the unit and cause unnecessary losses.

3. The output transformer cannot operate unloaded for long periods. Always connect speakers, headphones or other loads. Prolonged no‑load operation may lead to transformer breakdown and burnout.

Vacuum‑Tube Notes

1. Standby mode cuts off both high‑voltage and filament power for vacuum tubes. This prevents “cathode‑poisoning” caused by filament‑only power and extends tube service life.

2. After hot‑state shutdown, wait 1‑2 minutes before restarting to avoid power‑on pop noise.

3. If a tube fails and produces abnormal noise, record a video for feedback. Tube replacement service is available upon request.

Power‑Supply Notes

1. Dual‑mains‑voltage range: 115‑230 V, pre‑set at factory for different regions. Do not modify manually; risk of unit burnout.

Volume Operation Notes

1. Turn down the volume before every use, then gradually increase volume to your preferred listening level to protect headphones from damage.

Note

1. Slight non‑toxic odor may occur on first‑time use as transformer insulation materials heat up. Operate the unit in a ventilated area for some time; the odor will gradually dissipate.