AMERITRON AL-811H Instruction Manual
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AMERITRON AL-811H Instruction Manual

Hf power linear amplifier
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The Ameritron AL-811H is an economical 800 watt PEP output linear
amplifier that operates reliably from 160 through15 meters. The AL-
811H uses four 811A tubes in a class AB2 grounded grid circuit. Heavy
duty power supply and RF components provide long service for
components. The AL-811H/HY is shipped factory wired for 120 volt,
50/60 Hz power mains. The AL-811HX/HY export model is shipped
factory wired for 240 volt, 50/60 Hz power mains. The AL-811HX/HY
operates from 160 thru 10 meters.
PLEASE READ THIS MANUAL BEFORE OPERATING THIS EQUIPMENT !
Version 6
Printed in U.S.A.
AMERITRON AL-811H
INSTRUCTION MANUAL
116 Willow Road
Starkville, MS 39759 USA
662-323-8211
HF POWER
LINEAR AMPLIFIER

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Summary of Contents for AMERITRON AL-811H

  • Page 1 HF POWER LINEAR AMPLIFIER INSTRUCTION MANUAL The Ameritron AL-811H is an economical 800 watt PEP output linear amplifier that operates reliably from 160 through15 meters. The AL- 811H uses four 811A tubes in a class AB2 grounded grid circuit. Heavy duty power supply and RF components provide long service for components.
  • Page 2 NOTE: Fuses supplied are for 120/110/100V operation (Models AL-811H/HY). If you are rewiring the AL-811H for 240/230/220V operation, you must use 8 ampere fuses. The AL-811HX export model is pre-wired for 240V operation and is supplied with 8 ampere fuses.
  • Page 3 The AL-811H is a grounded grid linear amplifier developed by Frequency Coverage Ameritron using low cost 811A power triodes. It operates in Domestic model (AL-811H): 160, 80, 40, 30, 20, 17 and 15 class AB2 for SSB and CW. meter bands...

  • Page 4: General Information

    The interlock switch stays closed to allow AC line voltage to ALC line disconnected. The ALC line can then be connected reach the power transformer as long as the AL-811H's top cover and the ALC control on the amplifier can be adjusted to a point is in place.

  • Page 5: Installation

    The exhaust air flow is over 20 CFM. Do not "assist" the appropriate setting indicated by the chart below. Note: the AL- air flow unless the fan exceeds the AL-811H fan CFM by a 811H transformer allows operation on 100V line voltage in factor of 2:1.
  • Page 6 Connect the RF output of the transmitter or transceiver to Connect the shortest possible ground lead from a good earth the RF IN connector on the rear of the AL-811H with 50 ground to the GND terminal. The best leads are solid ohm coax.
  • Page 7 It should be 75mA. instructions on page 4 for wiring details. NOTE: The no drive current will vary up to 25% due to Set the AL-811H front panel switches as follows: component and line voltage tolerances. During POWER/OFF-ON to OFF tune up, limit Key to 7 seconds.

  • Page 8: Qsk Operation

    Ameritron offers a high Ameritron for details on the QSK-5. The AL-811H will operate with full output on all WARC bands except 24.5 MHz The AL-811HX/HY will operate with full output on all WARC bands STANDARD FREQUENCY COVERAGE...

  • Page 9: Periodic Maintenance

    PERIODIC MAINTENANCE The high voltage present on the plate choke and air variable Remove the cover and connect a jumper wire from ground to the capacitors attract dust and dirt out of the air stream. It is anode connection of the tubes. particularly important that the high voltage areas at the bottom NOTE: This is a safety wire that must be installed when of the of the plate choke and the insulator on the air variable...
  • Page 10 AL-811H SCHEMATIC Power supply shown wired for 120V operation *...

  • Page 11: Parts List

    AL-811H INPUT CHART BAND C3 (pF) C4 (pF) 28.75T (405-1287) 1300 (250-1130E) 100 (250-0100) 23.75T (405-1237) 500 (250-0500) 750 (250-0750) 13.75T (405-1137) 500 (250-0500) 120 (250-0120) 20/30 330 (250-0330) 9.75T (405-1097) 270 (250-0270) 15/17 120 (250-0120) 6.75T (405-1067) 150 (250-0150)
  • Page 12 PARTS LIST (ctd.) Designation Description Ameritron Part # 2N3904 TRANS 305-3904 MJF3055 TRANS 305-3055J 4.7k Ohm, 1/2 Watt 101-3470 R2, 3, 4, 5 50k Ohm, 7 Watt, Type 170S 107-4500 R6, 7 1 Meg Ohm, 3 Watt 104-6100 1.5 Ohm, 3Watt, Type 135 104-0150 0.6 Ohm, 3 Watt, Type 135...

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