AL-800H Instruction Manual
iii
Table of Contents
Unpacking Instructions ....................................................................................................iv
Features............................................................................................................................1
AL-800H Technical Specifications .................................................................................2
General Information.........................................................................................................3
Safety Interlock....................................................................................................3
ALC .....................................................................................................................4
Dynamic Bias.......................................................................................................4
Timer - Overload Circuits................................................................................................5
Grid Overload Protection.....................................................................................5
Thermal Overload ................................................................................................5
Cathode Warm-up Timer.....................................................................................5
Power Supply...................................................................................................................6
Heater Supply ......................................................................................................6
Plate (HV) Supply................................................................................................6
Meters ..............................................................................................................................6
Current Meter (plate and grid):............................................................................6
Multimeter ...........................................................................................................7
Multimeter Functions ..........................................................................................7
Wattmeter Circuit ................................................................................................7
Peak Envelope Power vs. Average Power ...........................................................8
Tube Life .........................................................................................................................8
Export Modifications .......................................................................................................9
Technical Assistance .......................................................................................................10
Installation Guidelines and Suggestions ..........................................................................11
Location Of The Amplifier .................................................................................11
Ventilation ...........................................................................................................11
Power Connections ..............................................................................................11
Grounding ............................................................................................................12
Transformer Connections ................................................................................................13
Interconnections...............................................................................................................13
Operating Instructions And Guidelines ...........................................................................14
Front Panel Controls ............................................................................................14
"MULTIMETER" Switch ........................................................................14
"OFF-ON" Switch....................................................................................14
"STBY-OPR" Switch...............................................................................14
"PLATE" Control ....................................................................................15
"LOAD" Control......................................................................................15
ALC Metering, Controls, and Adjustments .....................................................................15
ALC Metering Functions .....................................................................................15
ALC Controls.......................................................................................................16
ALC Adjustments ................................................................................................16
Rear-panel "ALC LIMIT" control .......................................................................17
ALC Limit Adjustment (rear panel) ....................................................................17
Driving Power..................................................................................................................18
Tube and Component Life ...............................................................................................18
