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Table of Contents
Ameritron AL-572
Instruction Manual
i
Table of Contents
Introduction ................................................................................................................................. 1
Unpacking Instructions................................................................................................................ 2
Features ....................................................................................................................................... 3
AL-572 Technical Specifications................................................................................................ 4
Input ................................................................................................................................ 4
Output.............................................................................................................................. 4
Efficiency ........................................................................................................................ 4
Power Supply .................................................................................................................. 4
Tube................................................................................................................................. 5
Metering .......................................................................................................................... 5
ALC................................................................................................................................. 5
Relay................................................................................................................................ 5
Connectors....................................................................................................................... 5
Physical ........................................................................................................................... 5
General Information .................................................................................................................... 6
Safety Interlock ............................................................................................................... 6
Peak Envelope Power vs. Average Power....................................................................... 6
Circuit Descriptions..................................................................................................................... 7
ALC................................................................................................................................. 7
Dynamic Bias .................................................................................................................. 7
Wattmeter Circuit............................................................................................................ 8
Power Supply .............................................................................................................................. 8
Filament Supply .............................................................................................................. 8
Plate (HV) Supply ........................................................................................................... 8
Meters.......................................................................................................................................... 8
Current Meter (plate and grid)......................................................................................... 8
Multimeter....................................................................................................................... 9
Multimeter Functions .......................................................................................... 9
HV ........................................................................................................... 9
REF.......................................................................................................... 9
ALC......................................................................................................... 10
ALC SET................................................................................................. 10
Tube Life ..................................................................................................................................... 10
Export Modifications .................................................................................................................. 11
Technical Assistance ................................................................................................................... 12
Notes................................................................................................................................ 12
Installation Guidelines And Suggestions .................................................................................... 13
Location Of The Amplifier.............................................................................................. 13
Ventilation....................................................................................................................... 13
Power Connections.......................................................................................................... 13
Grounding........................................................................................................................ 14
Transformer Connections................................................................................................ 15
Interconnections .......................................................................................................................... 16 Ameritron AL-572
Instruction Manual
ii
Operating Instructions And Guidelines....................................................................................... 16
Front Panel Controls........................................................................................................ 16
"MULTIMETER" Switch ................................................................................... 16
"OFF-ON" Switch ............................................................................................... 16
"STBY-OPR" Switch .......................................................................................... 16
"PLATE" Control ................................................................................................ 17
"LOAD" Control ................................................................................................. 17
ALC Metering, Controls, and Adjustments..................................................................... 17
ALC Metering Functions..................................................................................... 17
ALC......................................................................................................... 17
ALC SET................................................................................................. 18
ALC Controls ...................................................................................................... 18
ALC Adjustments................................................................................................ 18
SSB Operation......................................................................................... 18
CW Operation ......................................................................................... 18
Rear-panel "ALC LIMIT" control ....................................................................... 19
ALC Limit Adjustment (rear panel).................................................................... 19
Driving Power ................................................................................................................. 20
Tube and Component Life............................................................................................... 20
Tuning ............................................................................................................................. 21
Tuning Procedure ................................................................................................ 22
"ALC SET" control ............................................................................................. 24
Additional SSB Notes ..................................................................................................... 25
AM (Amplitude Modulation) Operation ......................................................................... 25
Audio Distortion.............................................................................................................. 25
FM (Frequency Modulation), RTTY, and DIGITAL OPERATION .............................. 26
QSK Operation................................................................................................................ 26
Periodic Maintenance.................................................................................................................. 26
Parts List...................................................................................................................................... 28
Power Supply / SWR Board (50-0057-1)...........................