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Audio Design Associates
www.ada-usa.com
PTM-3245
www.ada-usa.com
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AC Voltage Selection Switch
The PTM-3245 can operate on either 110-120 Vac or 220-240 Vac operation. When you purchased
the amplifier, the rear panel voltage selector switches were preset for the proper voltage in your area.
Nevertheless, it’s wise to double-check it before plugging into an AC outlet. If you move to a location
with a different line voltage, you can easily convert the PTM-3245.
For 110-120 Vac Operation:
Slide both voltage selector switches in their uppermost position until
the indent on the switch lines up with the 115 V label on the rear panel. In this position, the 115 V
label on the selector switch will also be visible.
For 220-240 Vac Operation:
Slide both voltage selector switches in their lowermost position until
the indent on the switch lines up with the 230 V label on the rear panel. In this position, the 230 V
label on the selector switch will also be visible.
Maintaining Your ADA Amplifier
Your ADA PTM-3245 power amplifier requires no periodic maintenance and has no user-serviceable
parts inside. To avoid the risk of electric shock, do not remove its top cover. The amplifier’s exterior can
easily be cleaned with a soft cloth pre-moistened only with a few drops of water or glass cleaner.
Power Fuse
There are two fuse posts on the rear panel of the PTM-3245 labeled Standby and Main. In the event of
a power surge, voltage spike, or internal failure, one or both of these fuses may blow. If the PTM-3245
stops operating, check both of these fuses. Always replace the fuses with the original value. Replacing fuses
with higher than rated values may cause serious damage that will not be covered under warranty.
PTM-3245 Recommended Fuse Values
AC Line Voltage
Main Fuse
Standby Fuse
110-120 Vac
10 Amp slow blow
200 milliamp slow blow
220-240 Vac 5 Amp slow blow
100 milliamp slow blow
