AMERITRON AL-1200 User Manual

AMERITRON AL
-
1200
FULL POWER
LINEAR AMPLIFIER
INSTRUCTION MANUAL
The Ameritron AL-1200 is a 1500 watt output linear amplifier
that operates from 160 through 15 meters. The Ameritron AL-
1200X is the export model and covers 160 through 10 meters.
The AL-1200 uses a single 3CX1200A7 tube in a class AB2
grounded grid circuit. CW, FM and RTTY efficiency is
improved by shifting the bias deeper into class B. The heavy
duty power supply and RF components, combined with a forced
air system utilizing chimneys, provide long service life for
expensive components. The AL-1200 is shipped factory wired
for 240 volt, 50/60 Hz power mains.
PLEASE READ THIS MANUAL BEFORE OPERATING THIS E
Q
UIPMENT!
116 Willow Rd.
Starkville
,
MS 39759

AMERITRON AL-1200 Specifications

General

Input Impedance	50 Ohms
Output Impedance	50 Ohms
ALC	Yes
Cooling	Forced Air
Power Requirements	220VAC, 50/60 Hz
Frequency Range	1.8 to 30 MHz
Power Output	1200 Watts PEP
Gain	13 dB

Summary

UNPACKING INSTRUCTIONS

PRODUCT FEATURES AND SPECIFICATIONS

Key Features Overview

Highlights features like tube type, meters, and switches for operation.

Technical Specifications

Details input/output circuits, power supply, tube, and metering parameters.

SAFETY AND PRELIMINARY PROCEDURES

Safety Interlock and Driving Power

Covers safety interlock, driving power, and avoiding distortion.

Filament Supply and Maintenance

Discusses filament circuit, blower speed, and periodic maintenance.

INSTALLATION GUIDELINES

Transformer Installation

Step-by-step guide for mounting the transformer and connecting primary leads.

Metering System Explanation

Explains how to read and interpret the Grid Current and other meter displays.

TRANSFORMER AND TUBE INSTALLATION

Transformer Wiring for 220V

Instructions for modifying transformer connections for 220V operation.

Tube Installation and Chimney

Details on installing the 3CX1200A7 tube and its anode connector/chimney.

WIRING INSTRUCTIONS

Filament and Blower Wiring

Details transformer lead color codes and blower speed control.

INTERCONNECTION AND OPERATING ENVIRONMENT

Interconnection Diagram

Shows RF, control, and power connections between units.

Location and Ventilation Requirements

Guidelines for optimal placement and airflow to ensure proper cooling.

TUNING AND OPERATION PROCEDURES

Tuning Controls Explained

Explains the function of PLATE and LOAD controls for optimal tuning.

CW Tuning Steps

Step-by-step guide for tuning the amplifier for CW operation.

ADVANCED OPERATION AND SAFETY

ALC Control and SSB Procedure

Explains ALC adjustment, SSB procedure, and peak power monitoring.

Critical Safety Warning

Emphasizes fatal voltage hazards and the need to disconnect power before access.