The TMOS FET devices used in the ALS-600 have nearly the same momentary overload
tolerance as vacuum tubes. The low pass output network in the ALS-600 is much
broader in bandwidth and less sensitive to load changes than the networks used in tube
type amplifiers.
This makes the ALS-600 much less sensitive to frequency and SWR changes than the
best "no- tune" tube amplifiers but not as good as adjustable pi-networks. The ALS-600's
multiple section output network and push-pull output configuration offers much better
harmonic suppression than most tube amplifiers regardless of load SWR.
The only danger presented by a high SWR in this amplifier is that the current and power
dissipation in the output devices may exceed safe limits. Lengthy operation with high
SWR at high power levels can result in heat damage and failure of the FET devices. If
the reflected power exceeds 50 watts the power level should be reduced until the reflected
power indicated on the internal meter is 50 watts or less on peaks. At approximately 75
watts of reflected power the internal safety circuitry will disable the amplifier.
ALS-600PS POWER SUPPLY CIRCUITRY (ALS-600PS)
Line Voltage Modifications
The line input voltage of the ALS-600PS can be changed by moving jumper wires on the
power supply printed circuit board to new locations. The ALS-600PS is wired for
standard 120 VAC operation unless otherwise indicated.
Warning: Never unplug the power cable from the amplifier while the power supply
is connected to the power line. AC power line voltage is present on the
power cable connector pins.
Warning: Never remove the cover of the power supply while it is connected to the
power line.
Refer to the following chart for the proper location of the primary wiring. This chart lists
the proper jumper connections for different ranges of MAXIMUM line voltage.
It is always best to carefully measure your AC line voltage prior to setting the voltage
strapping.. The standard line voltage in the USA is NOT 110 and 220 volts. It is almost
ALWAYS above 120 volts or 240 volts.
Caution: Never exceed the voltage in this chart for each wiring configuration. If the
output voltage of this supply exceeds 65 volts, damage to the amplifier may
occur.
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