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1. Before connecting or disconnecting other devices, unplug the
TUBE53’s AC power cord from the outlet.
2. To avoid noise from your speakers, turn your system components
on or off in the following order:
Power on: Turn on other devices connected to the TUBE53’s inputs first, before
turning the TUBE53 on.
Power off: Turn the TUBE53 off first, before turning off any connected devices.
3. Handle with care
Avoid exerting excessive force to the glass cover, knobs and cabinet on the
TUBE53.
4. Installation
Use of an audio rack is recommended to maximize the sound quality and per-
formance of the TUBE53. Installation and use of the TUBE53 in the locations
described below may cause deterioration in sound quality or malfunction:
• Locations exposed to direct sunlight - such as windowsills, and other ex-
ceptionally warm locations - such as near heating appliances (surrounding
temperature higher than 35 ℃), or exceptionally cold locations (surrounding
temperature lower than 5 ℃), can prevent the TUBE53 from functioning
properly.
• Damp locations exceeding 90% humidity may cause the TUBE53’s metal
parts to rust, causing the unit to malfunction.
• Dusty locations may cause contact failure of the switches and noise, and may
result in deteriorated performance of the TUBE53.
• Otherwise, avoid installing the TUBE53 close to other transformers and
electrical motors, so as to prevent the pickup of induction hum. Also, avoid
mounting the TUBE53 on surfaces that may be affected by vibration.
5. Avoid lightning strikes
Disconnect the AC power cord from the AC outlet when there is a thunderstorm
in your vicinity.
