Version 0A 7
Quick Start
Installation and Operation
WARNING: Do not block ventilation holes. Do not expose to moisture,
water, or external heat.
This power amplifier system consists of two units, a power supply and an amplifier
section. The amplifier section has metering and operator functional controls. Locate the
amplifier section at a convenient place with proper space for airflow, within the
operator’s reach and view. The power supply can be placed anywhere within cable
length limits. Do not extend the amplifier power supply dc power cable.
Power Line or Mains Connections
There are two distinctly different power supplies available for the ALS-606. The ALS-
600PS is more basic unregulated choke input supply. The ALS-600SPS is a state-of-
the-art regulated switching mode supply. Please read the appropriate sections below.
For non-export use, each supply comes with a standard NEMA 5-15P two-blade 120V
15A plug with round safety-ground pin.
Overall amplifier operation remains similar with either supply; except the linear supply
has a RTTY and Normal voltage switch. The RTTY position allows higher amplifier
efficiency at reduced power. See the power supply details included with the particular
power supply for details specific to each supply. This includes operation on various line
voltages, power supply operation, fuse selection, location, and power supply trouble
shooting.
Non-export versions of Ameritron ALS-600 series power supplies are wired and fused
for 120Vac USA power mains, but all are modifiable to other standard power mains
voltages.
ALS-600SPS
The USA standard version ALS-600SPS is supplied wired for 95-135 Vac, 50-400 Hz,
15-ampere or larger electrical service. Reconfiguring internal jumpers on the power
supply board will allow 185-260 volt operation.
The ALS-600SPS is internally regulated. Beyond 120 or 240V concerns, the ALS-
600SPS does not require voltage tap changes. There should be very little change in
HV1 (PA voltage) with amplifier power and line voltage. Less than 3 volts change from
the 50Vdc nominal voltage is acceptable.
Do not operate with line voltage below 95 or above 135 volts when wired for 120 volts,
or below 185 or above 260 volts when wired for “240 volts”.
Unless power mains fall below 100 volts, the ALS600SPS switching supply provides the
same performance on 120-volts as on 240-volts. The only function reasons for 240-volt
power mains are light dimming and unintentional circuit breaker opening. If outlet wiring
is already loaded heavily, or if house wiring is sized too small for the distance to the
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