AMERITRON AL-1500 Instruction Manual

AL-800H Instruction Manual i WARNING!! NEVER APPLY POWER TO THIS AMPLIFIER WITH THE COVER REMOVED! CONTACT WITH THE VOLTAGES INSIDE THIS A

AL-800H Instruction Manual 6 Power Supply Heater Supply The heater circuit of this amplifier satisfies all requirements of the tube manufacturer r

AL-800H Instruction Manual 7 Multimeter The multimeter is the meter on the right. It continuously reads the forward peak envelope power on its left

AL-800H Instruction Manual 8 Peak Envelope Power vs. Average Power Peak envelope power (PEP) is often misunderstood. PEP is not associated with the si

AL-800H Instruction Manual 9 The continuous commercial plate current rating of each 3CX800A7 is 600 mA. Brief periods of plate current exceeding 1.5

AL-800H Instruction Manual 10 Technical Assistance Technical assistance is available during normal central standard time business hours on weekdays.

AL-800H Instruction Manual 11 Installation Guidelines and Suggestions Location Of The Amplifier Do not install the amplifier in excessively warm loc

AL-800H Instruction Manual 12 Grounding Connect a good RF and dc ground to the ground post on the rear panel of the amplifier. Use the heaviest and s

AL-800H Instruction Manual 13 Transformer Connections The power transformer of the AL-800H has fourteen different voltages available on the primary a

AL-800H Instruction Manual 14 3. Shielded audio type cable with a standard male phono plug should be used to connect to the "RLY" jack o

AL-800H Instruction Manual 15 "PLATE" Control The "PLATE" control adjusts the output tank circuit to resonance. This control sho

AL-800H Instruction Manual ii Unpacking Instructions Remove the 3CX800A7 tubes from their shipping cartons. Carefully unwrap the tubes and inspect t

AL-800H Instruction Manual 16 ALC Controls The position of the "ALC SET" control determines the grid current value that will begin to produc

AL-800H Instruction Manual 17 Rear-Panel "ALC LIMIT" Control The "ALC Limit" control (rear panel) limits the maximum voltage avai

AL-800H Instruction Manual 18 Driving Power This amplifier is designed to operate at full ratings when it is driven by an exciter that has approximat

AL-800H Instruction Manual 19 Tuning Follow the instructions below in numerical order. Proper tuning will produce excellent output power, a clean si

AL-800H Instruction Manual 20 5. Place the amplifier's "BAND" switch on the same band as the exciter. Set the "PLATE" cont

AL-800H Instruction Manual 21 > STEPS 10a AND 11a REQUIRE A CONNECTION FROM THE AMPLIFIER'S ALC OUTPUT TO THE EXCITER'S ALC INPUT. >

AL-800H Instruction Manual 22 "ALC SET" Control Proper adjustment of the front panel "ALC SET" control accomplishes the following:

AL-800H Instruction Manual 23 FM (Frequency Modulation), RTTY, and Digital Operation The efficiency of this amplifier will approach 65% in the FM, R

AL-800H Instruction Manual 24 Periodic Maintenance The high voltage present on various parts of the amplifier will attract dust and dirt. The high v

AL-800H Instruction Manual 25 Parts List Power Supply / SWR Board (50-0800H-1) Designator Description Ameritron P/N D101, 102, 114, 115 1N34A 300-

AL-800H Instruction Manual iii Table of Contents Unpacking Instructions...

AL-800H Instruction Manual 26 Tuned Input Board (50-0800H-2) Designator Description Ameritron PN C201 (tube side) See input chart See input chart

AL-800H Instruction Manual 27 Timer / Overload Board (50-0117-2) Designator Description Ameritron P/N C501-506 .01 uF 50 V disc 200-0416 C507,508 .4

AL-800H Instruction Manual 28 AL-800H Main Chassis Parts List Designator Description Ameritron P/N B1 Blower (Howard 3-90-8538) 410-3590 C1, 6 17

AL-800H Instruction Manual 29 Frequency Coverage AL-800H AL-800HX 160 meters 1.8-2.0 MHz 160 meters 1.8-2.0 MHz 80 meters 3.3-4.4 MHz 80 meters

AL-800H Instruction Manual 30 Notes:

AL-800H Instruction Manual iv Tuning...

AL-800H Instruction Manual 1 Features • The AL-800H uses two reliable high gain 3CX800A7 tubes. • A time-delay circuit provides a 180 second warm-u

AL-800H Instruction Manual 2 AL-800H Technical Specifications* Input: Circuit type: Pi-network, slug tuned coils Maximum VSWR at resonance:

AL-800H Instruction Manual 3 Ameritron Al-800H 1500 Watt Linear Amplifier Instruction Manual The Ameritron AL-800H is a 1500 watt output linear ampli

AL-800H Instruction Manual 4 ALC The AL-800H is one of the few amplifiers using a "true" automatic level control [ALC] circuit. In this amp

AL-800H Instruction Manual 5 Timer - Overload Circuits CAUTION: Never modify or disable protection circuits without factory approval. Doing so wi