Instruction manual

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AL-800 Instruction Manual

Features

1. The AL-800 uses a rugged

high-gain

3CX800A7 tube

2. A

time-delay circuit

provides a 180 second warm-up to eliminate potential damage to the tube

cathode.

3. A

grid overload circuit

quickly disables the amplifier if the grid current becomes excessive.

This feature prevents excessive grid current from causing distortion or damaging the tube or

other components.

4. A

thermal overload

automatically disables the amplifier if excessive heating of the power

transformer occurs.

5. A

dynamic

bias circuit

eliminates hundreds of watts of unnecessary heat generation in the

power amplifier tube. The result is cooler operation and longer component life.

6. A

multi-voltage heavy-duty transformer

with a unique "buck-boost" winding allows

adjustment of the primary voltage to 14 different voltages centered on 115 and 230 volts. This

versatile Ameritron feature allows the user to select the optimum primary voltage for maximum

performance and life.

7. The tuning and loading controls have

vernier 6:1 reduction

drives for smooth tuning.

Logging scales allow quick and repeatable control adjustments for rapid band changes.

8. The AL-800 has two

illuminated cross-needle panel meters

. The left meter provides a

continuous reading of grid and plate currents. The right meter reads peak RF power output on

one scale and Plate Voltage (HV), Reflected power and SWR (REF), ALC detector voltage

(ALC), and ALC adjustment level (ALC SET) on the other scale.

9. Heater and plate voltages are maintained using the

"STBY/OPR"

switch. This allows the

amplifier to be conveniently bypassed for "barefoot" operation.

10. A front panel

"ALC SET" control

allows convenient adjustment of the ALC threshold. The

unique ALC circuit samples the grid current and power supply voltage.

11.

"XMT"

and "

OL"

LED's on the front panel indicate proper operation of the amplifier.

12. A rear panel

12 Volt auxiliary output jack

provides up to 200 mA at 12 Vdc for accessories

such as the ATR-15 Antenna Tuner.

13. A

step-start circuit

limits the inrush current to the power supply and tube heater. This circuit

extends the life of the amplifier components.