AMERITRON AL-1200 Instruction Manual - Page 7
Browse online or download pdf Instruction Manual for Amplifier AMERITRON AL-1200. AMERITRON AL-1200 15 pages. Full power linear amplifier
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Caution: This page is only valid for transformers that contain these exact color codes for the
primary winding. Early production units did not contain a multiple tap transformer. If the terminal
strip has all these color coded wires, then the unit has the multiple tap transformer.
FILAMENT/BLOWER WIRING INSTRUCTIONS
The AL-1200 amplifier comes prewired for 240V line voltage and with the blower prewired for medium high fan speed.
This page gives filament transformer connection details for various line voltages and blower speeds. The five lug terminal
strip and the single lug terminal strip are located immediately behind the ON/OFF rocker switch inside the unit. The
drawing below shows the connection of transformer leads and their purpose.
This chart shows the color code of the transformer leads and their purpose. The number in paren-
thesis indicates the number of the terminal lug that the transformer lead is connected to. The number
three (3) lug is not used to change the filament or blower wiring. Do not add or remove any wires
from the number three (3) lug. Refer to the drawing above. Use the lug numbers above when referr-
ing to both of the Filament connection chart and the Blower connection chart below.
FILAMENT TRANSFORMER LINE VOLTAGE
There are two wires that connect to the terminal lugs
which determine the Filament Line Voltage. The BLACK
wire from the power switch and WHITE wire from rear of
the unit connect to different terminal lugs depending on the
voltage desired. The AL-1200 comes prewired for 240V
operation*. Refer to the chart below. The voltage listed in
the chart below is the maximum line voltage that should be
applied to a given tap. Operation with line voltage in excess
of the tap voltage selected can result in a reduction of tube
life. '
BLOWER
The GREEN and WHITE wires from the rear of the unit
connect to the terminal lugs to control the air speed of the
fan. The AL-1200 is prewired for the medium high speed
setting*. Refer to the chart below. The blower connections
can be moved to lower speed taps if air noise is excessive.
Ameritron recommends using the highest speed tap that
noise considerations permit. The lowest speed tap will
develop sufficient air flow for standard amateur SSB and
CW full power operation. The highest speed taps should be
used for contest or RTTY operation.