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The Ameritron AL-811HD is an economical 800 watt PEP output linear
amplifier that operates reliably from 160 through15 meters. The AL-
811HD uses four 572B tubes in a class AB2 grounded grid circuit. Heavy
duty power supply and RF components provide long service for
components. The AL-811HD/DY is shipped factory wired for 120 volt,
50/60 Hz power mains. The AL-811HDX export model is shipped factory
wired for 240 volt, 50/60 Hz power mains. The AL-811HDX/DY operates
from 160 thru 10 meters.
PLEASE READ THIS MANUAL BEFORE OPERATING THIS EQUIPMENT !
Version 6
Printed in U.S.A.
AMERITRON AL-811HD
116 Willow Road
Starkville, MS 39759 USA
662-323-8211
HF POWER
LINEAR AMPLIFIER
INSTRUCTION MANUAL
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Summary of Contents for AMERITRON AL-811HD
- Page 1 HF POWER LINEAR AMPLIFIER INSTRUCTION MANUAL The Ameritron AL-811HD is an economical 800 watt PEP output linear amplifier that operates reliably from 160 through15 meters. The AL- 811HD uses four 572B 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-811HD/HDY). If you are rewiring the AL-811HD for 240/230/220V operation, you must use 8 ampere fuses. The AL-811HDX export model is pre-wired for 240V operation and is supplied with 8 ampere fuses.
- Page 3 The AL-811HD is a grounded grid linear amplifier developed Frequency Coverage by Ameritron using low cost 572B power triodes. It operates in Domestic model (AL-811HD): 160, 80, 40, 30, 20, 17 and 15 class AB2 for SSB and CW. meter bands Export model (AL-811HDX/HDY): 160, 80, 40, 30, 20, 17, 15, 1.
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Page 4: General Information
This voltage should be used to limit the exciter Written assistance is also available. Due to time delays in processing drive to safe drive levels for the AL-811HD for exciters that mail, please allow at least three weeks for a written reply. -
Page 5: Installation
2. The exhaust air flow is over 20 CFM. Do not "assist" the 811HD transformer allows operation on 100V line voltage in air flow unless the fan exceeds the AL-811HD fan CFM by countries such as Japan. a factor of 2:1. - Page 6 1. Connect the RF output of the transmitter or transceiver to 4. Connect the shortest possible ground lead from a good the RF IN connector on the rear of the AL-811HD with 50 earth ground to the GND terminal. The best leads are solid ohm coax.
- Page 7 See the 3 1/2 instructions on page 4 for wiring details. NOTE: The no drive current will vary up to 25% due to 1. Set the AL-811HD front panel switches as follows: component and line voltage tolerances. During POWER/OFF-ON to OFF tune up, limit Key to 7 seconds.
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Page 8: Qsk Operation
Ameritron offers a high Contact Ameritron for details on the QSK-5. The AL-811HD will operate with full output on all WARC bands except 24.5 MHz The AL-811HDX/HDY will operate with full output on all WARC bands... -
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 capacitors attract dust and dirt out of the air stream. It is the 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-811HD SCHEMATIC Power supply shown wired for 120V operation *...
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Page 11: Parts List
AL-811HD 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...
- Page 16 IMITED ARRANTY Ameritron warrants to the original purchaser that this product shall be free from defects in material or workmanship for one year from the date of original purchase. During the warranty period, Ameritron (or an authorized Ameritron service facility) will provide free of charge both parts and labor necessary to correct defects in material or workmanship.
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