Ameritron AL-811 & AL-80B - Best Value Amplifiers

Discussion in 'Amateur Radio Equipment Reviews' started by N8FVJ, Oct 9, 2019.

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  1. W5LZ

    W5LZ Ham Member QRZ Page

    While you're doing all the tube swapping, you might take a look at filament requirements too.
     
  2. N8FVJ

    N8FVJ Ham Member QRZ Page

    572B and 811A have same filament current draw. No issue swapping tubes, no modifications required.
     
  3. W5LZ

    W5LZ Ham Member QRZ Page

    :) you will find out...
     
  4. N8FVJ

    N8FVJ Ham Member QRZ Page

    Again both 811A & 572B are 6.3 volts @ 4 amp filaments. Despite W5LZ warnings, you can safely swap tubes. 1000s of Ham have done this.
     

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