Ameritron AL-80A tuned input

Discussion in 'Amateur Radio Amplifiers' started by N9HSB, Apr 1, 2011.

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  1. N9HSB

    N9HSB Ham Member QRZ Page

    I am in need of a sketch or photo showing which tuning slug is for what band on the AL-80A tuned input circuit.

    73
    Cliff
    n9hsb
     
  2. W9GB

    W9GB Ham Member QRZ Page

    I see from the Ameritron AL-80A manual that -- you don't have these holes ?
    http://www.ecse.rpi.edu/Courses/CStudio/docs/al80a.pdf

    [​IMG]

    On the upper left side of the Rear Panel of the Ameritron AL-80B are holes for adjustments of the input Pi-Network.
    Those holes should be marked (labeled) for each band segment.

    [​IMG]

    Ameritron AL-80B Tuned Input Board is located behind 3-500Z tube compartment.

    Thanks to K7SFN for the Ameritron photos !!
    ====
    w9gb
     
    Last edited: Apr 2, 2011
  3. W8JI

    W8JI Ham Member QRZ Page

    It's been years since I designed that amp, but as I recall starting at the top is 10. At the bottom is 160. They are in order of the bands. They are a .1 inch hex, and you must use a non-metallic alignment tool. The exact slug and coil are no longer available new, so be careful.

    They should never drift off. Is the SWR on the input really high on some bands??
     
  4. N9HSB

    N9HSB Ham Member QRZ Page

    That's a big help.
    I need to set it at a happy medium for 15-17 and 12-10. So looking at it from the front the left coil on top is 10-12 and the bottom coil on the side is 160?
    Gosh Tom it's good to hear from you again. Shoot me an email at my call at arrl.net and let me know how you have been.
    73
    Cliff
     
    Last edited: Apr 2, 2011
  5. KM1H

    KM1H Ham Member QRZ Page

    I happen to have one in for service right now if I can help.

    Carl
     
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