AL-800H Instruction Manual
3
Ameritron Al-800H 1500 Watt Linear Amplifier Instruction Manual
The Ameritron AL-800H is a 1500 watt output linear amplifier that operates from 160 through 15 meters.
The AL-800HX is the export model that operate from 160 through 10 meters. Export modification
instructions are only available with proof of a valid amateur radio license.
The AL-800H uses a pair 3CX800A7 tubes in a class AB2 grounded grid circuit. High-quality power
supply and RF components combine with an accurate peak-detecting directional coupler, front panel
adjustable true ALC circuit, electronic grid current and thermal overload protection, and automatic bias
switching to make this the best featured and most reliable 3CX800A7 amplifier available. The AL-800H
and AL-800HX are factory-wired for 240 volt, 50/60 Hz ac line voltage. All models are easily converted to
other supply voltages between 90 and 250 volts ac.
General Information
Safety Interlock
The top cover of the AL-800H operates an interlock switch which completes the primary circuit of the
power transformer. The interlock will open and de-energize the transformer primary if the top cover is
removed.
WARNING:
High voltage can kill!! Accidental contact with the voltages in this amplifier can be
lethal.
For your personal safety please observe the following precautions:
1.
NEVER
defeat the interlock.
2.
NEVER
remove the cover with the amplifier connected to the power line.
3.
ALWAYS
allow the capacitors to discharge for several minutes
after
unplugging the amplifier and
before
removing the cover.
4. ALWAYS
select the high-voltage (HV) function of the Multimeter to check the high voltage potential.
Do
not
remove the cover if voltage is indicated.
5. ALWAYS
ground the tube anode (outer metal surface) to the chassis through a low value, high
wattage resistor before touching anything inside the amplifier.
6. ALWAYS
be cautious of heat. Many components inside the amplifier operate at high enough
temperatures to cause burns.
7.
NEVER
make any unauthorized component or circuit modifications to this product. The
only
acceptable source for modifications is Ameritron or a source approved by Ameritron. Unauthorized
modifications almost certainly will
increase
the risk of equipment failure or personal injury.
