The Ameritron AL-80B is an 800 watt CW, 1000 watt PEP output linear amplifier that operates on all Amateur bands from 160 through 15 meters. The AL-80BX and AL-80BY are export models that operate from 160 through 10 meters. Export modification instructions are available with proof of a valid amateur radio license. The AL-80B uses a single 3-500Z tube in a class AB2 grounded grid circuit. High-quality power supply and RF components combine with an accurate peak-detecting directional coupler, front panel adjustable true ALC circuit, and automatic bias switching to make this the best featured and most reliable single 3-500Z amplifier available. The AL-80B and AL-80BY are factory-wired for 120 Vac, 50/60 Hz line voltage. The AL-80BX is factory wired for 240 Vac. All models are easily converted to other supply voltages between 90 and 250 Vac. · The AL-80B uses a rugged, inexpensive 3-500Z tube. · The 3-500Z requires only a few seconds of warm-up time. · 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. · 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 Vac. This versatile Ameritron feature allows the user to select the optimum primary voltage for maximum performance and life. · 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. · The AL-80B has two illuminated cross-needle panel meters. The left meter provides a continuous reading of grid and plate currents. The right meter indicates 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. · Filament and plate voltages are maintained using the "STBY/OPR" switch. This allows the amplifier to be conveniently bypassed for "barefoot" operation. · 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. · An "XMT" LED on the front panel indicates proper keying of the amplifier by the exciter. · A rear panel "12 V" auxiliary output jack provides up to 200 mA at 12 Vdc for accessories such as the ATR-15 Antenna Tuner. · A step-start circuit limits the inrush current to the power supply and tube filament. This circuit extends the life of the amplifier components.