AL-80B Instruction Manual
iii
Ameritron AL-80B
1000 watt PEP Linear Amplifier Instruction Manual
Features ....................................................................................................................................... 1
AL-80B Technical Specifications ...............................................................................................2
Introduction .................................................................................................................................3
Safety Interlock ...............................................................................................................3
Circuit Descriptions..................................................................................................................... 4
ALC................................................................................................................................. 4
Dynamic Bias .................................................................................................................. 4
Power Supply .............................................................................................................................. 5
Filament Supply .............................................................................................................. 5
Plate (HV) Supply........................................................................................................... 5
Meters..........................................................................................................................................5
Current Meter (plate and grid): ....................................................................................... 5
Multimeter....................................................................................................................... 6
Multimeter Functions......................................................................................................6
Wattmeter Circuit............................................................................................................ 7
Peak Envelope Power vs. Average Power....................................................................... 7
Tube Life..................................................................................................................................... 8
Export Modifications .................................................................................................................. 9
Technical Assistance................................................................................................................... 9
Installation Guidelines And Suggestions .................................................................................... 10
Location Of The Amplifier..............................................................................................10
Ventilation....................................................................................................................... 10
Power Connections.......................................................................................................... 10
Grounding........................................................................................................................ 11
Transformer Connections............................................................................................................12
Interconnections .......................................................................................................................... 13
Operating Instructions And Guidelines....................................................................................... 13
Front Panel Controls........................................................................................................13
"MULTIMETER" Switch ...................................................................................13
"OFF-ON" Switch............................................................................................... 13
"STBY-OPR" Switch.......................................................................................... 14
"PLATE" Control................................................................................................ 14
"LOAD" Control ................................................................................................. 14
ALC Metering, Controls, and Adjustments..................................................................... 14
ALC Metering Functions..................................................................................... 14
ALC Controls...................................................................................................... 15
ALC Adjustments................................................................................................ 15
Rear-panel "ALC LIMIT" control................................................................................... 16
ALC Limit Adjustment (rear panel)................................................................................ 17
Driving Power .............................................................................................................................17
Tuning ......................................................................................................................................... 18
Tuning Procedure............................................................................................................ 18
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