al80a meter replacement

Discussion in 'Amateur Radio Amplifiers' started by N8VUL, Jul 2, 2020.

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  1. N8VUL

    N8VUL Ham Member QRZ Page

    The specs say the movement is 0-1ma 450 ohm
     
  2. W1QJ

    W1QJ Ham Member QRZ Page

    Take the bad meter out, take the clear cover off, carefully remove the meter scale. You may have to run a razor knife between it and the housing to free it up. Once scale is off look inside you’ll probably see a single tiny resistor burned out. Then carefully check the meter movement with an ohm meter on mid scale like x 10k and see if the meter responds. It should be 300 ohms. If that’s the case just replace the blown resistor.
     
  3. W1QJ

    W1QJ Ham Member QRZ Page

    Oh missed this. Ok meter is bad. Did you find a single resistor inside in series with the movement? Is it blown too? Measure the resistance of that resistor. What is it? Should be 120 ohms. That means the movement is 300 ohms. Order a meter from Ameritron for any of the big 3 amps. Install the resistor and put the 80a scale on it. Fixed
     
  4. N8VUL

    N8VUL Ham Member QRZ Page


    The size of the meter is 3.5 in x 3in. The other amps meters seem to be 2.5x2.5 in.
     
  5. N8VUL

    N8VUL Ham Member QRZ Page

    so far all the advice is good. might have to do a work around on the size of the meter. I am waiting on a reply from PRIME INSTRUMENTS ( maker of the meter) to see if they have a replacement or a rebuild.
     
  6. W1QJ

    W1QJ Ham Member QRZ Page

    What is the size of the panel cut out for the meter. The meter here fits 3 1/4x 2 1/8. The 80a was an offering at the same time as the AL82/1200/1500 I’m pretty sure meters were same size. What size is the panel cut out you have there.
     
  7. W9GB

    W9GB Ham Member QRZ Page

    History of Ameritron AL-80 (after Dentron), by Tom W8JI.
    You will discover John Moran’s (Prime) involvement in resolving AL-80 issues,
    to become AL-80A.

    https://www.w8ji.com/Ameritron_al80_history.htm
    FD8B8A57-6D9A-4AA9-A1A4-9E9D30383105.jpeg
    ==
    Bill -
    You have good Analog meter repair shops in Cleveland and Detroit.
    Depending on damage to meter movement ...
    Expect minimum Repair Price to be 1/2 price of New.
    Cheap Chinese mfg. , not recommended, with COVID-19 shipment restrictions.


    Prime Instruments, is located in Cleveland, originally owned by John Moran, W8IOB (SK).
    https://www.primeinstruments.com/panel-meters/ammeters.html
    John was writing amplifier articles before WW2 (Radio, Nov. 1939, page 26)
    https://worldradiohistory.com/Archive-Radio/30s/Radio-1939-11.pdf

    Prime Instruments
    9805 Walford Ave.
    Cleveland, Ohio 44102 USA
    Email: info@primeinstruments.com
    Phone: 216-651-0400
    Fax: 216-651-5297
    ==
    Weschler Instruments
    16900 Foltz Parkway
    Cleveland, OH 44149
    Toll-Free: 866-865-6897
    Phone: 866-865-6897
    Fax: 440-238-0660
    Email: https://www.weschler.com/contact/
    ==
    RAM Meter has some radio amateurs, on staff.

    Ram Meter Inc.
    ATTN: Repair Department
    1815 Bellaire, Suite B
    Royal Oak, MI 48067
    https://www.rammeter.com/repair-calibration
    Form for Repair Work
    https://www.rammeter.com/media/bulletins/Ram Meter Inc Repair-Calibration Request Form1.pdf
     
    Last edited: Jul 2, 2020
  8. W1QJ

    W1QJ Ham Member QRZ Page

    Often times buying a meter direct from Ameritron May be cheaper than going to the manufacturer just like buying MFJ stuff is cheaper at the dealer than direct from mfj.
     
  9. N8VUL

    N8VUL Ham Member QRZ Page

    Best I can tell 3.5in wide x 3in tall
     
  10. W1QJ

    W1QJ Ham Member QRZ Page

    Did Prime get back to you on a price for the basic meter? I’m pretty certain the basic meter in the 80A and the big Three are the same basic meter. The 80a has an added resistor. A present day meter for any of the big three should be made to work with the right resistor.
     

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