AL-80B Instruction Manual
3
Introduction
The Ameritron AL-80B is an 800 watt CW, 1000 watt PEP output linear amplifier that operates on
all Amateur bands from 160 through 15 meters. The AL-80BX and AL-80BY are export models
that operate from 160 through 10 meters. Export modification instructions are available with proof
of a valid amateur radio license.
The AL-80B uses a single 3-500Z tube 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, and automatic bias switching to make this the best featured and most
reliable single 3-500Z amplifier available. The AL-80B and AL-80BY are factory-wired for 120
Vac, 50/60 Hz line voltage. The AL-80BX is factory wired for 240 Vac. All models are easily
converted to other supply voltages between 90 and 250 Vac.
Safety Interlock
The top cover of the AL-80B 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 several minutes for the capacitors to discharge 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 (top metal conductor) to the chassis before touching
anything inside the amplifier.
6. ALWAYS be cautious of heat. Many components inside the amplifier operate at high
temperatures.
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.
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