Ameritron al 811h alc. The following are known factory improvements as of The ALC cir...
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Ameritron al 811h alc. The following are known factory improvements as of The ALC circuit can be adjusted by loading the AL-811 slightly beyond the recommended maximum values with the ALC line disconnected. MFJ changed the AL-811 series over the years. You get absolute stability and superb performance on higher bands that can t be matched by un-neutralized tubes. It describes the features of the amplifier including 800 watt output power, tuned input matching, metering, safety interlock, and ALC. 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. You also get efficient full-size heavy duty tank coils, computer grade capacitors, heavy duty high silicon core power tran. Grid current is one of the best indicators of proper tube operation. New Style ALC Newer Ameritron units, those produced during or after the AL80B development period, use grid current to control the ALC system. The ALC line can then be connected and the ALC control on the amplifier adjusted to a point just before the drive begins to decrease. Multimeter: reads HV and plate current Grid meter: reads PA grid current Upgrade Kit AL811 and AL811H amplifier Rev3B 8/5/2025 Information in this modification manual is copyright 2025 by W8JI and CTR Engineering.
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