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Speaker impedance qusetion

Discussion in 'Electronic Repair' started by bq340, Dec 8, 2007.

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  1. bq340

    bq340 Guest

    My shortwave radio receiver's speaker is dead (Hallicrafters Model
    S-38). I can't find an exact physical match to it in the original 16 ohm
    impedance but can match it with a 8 ohm one that has the same mounting

    Can I just use the 8 ohm? or, if not, is there a way to adapt it to
    function without hurting the receiver or do I need to keep looking for a
    16 ohm?

  2. Meat Plow

    Meat Plow Guest

    It will be A-OK.
  3. bq340

    bq340 Guest


  4. Jerry G.

    Jerry G. Guest

    There is a good chance that it will be okay. This also depends on the
    output stage.

    After installing the speaker, run the sound up at a higher than normal
    listening volume for about 20 to 30 minutes. Measure the temperature
    of the audio output IC or transistors to see if they are running too
    hot. Most output devices can run safely at up to about 60 C under
    continous use.

    Jerry G.
  5. Meat Plow

    Meat Plow Guest

    Ummm I'm pretty sure the Halli S-38 is all toobs.
  6. Don Bowey

    Don Bowey Guest

    That is funny. It's output stage normally runs hot from it's 50 Volt
  7. Jerry G.

    Jerry G. Guest

    I didn't realize that it was a tube radio! I have not seen one of those in
    tens of years!

    If it is a tube output stage, then there is not much to worry about with
    some speaker impedance mismatch.


    Jerry G.

    That is funny. It's output stage normally runs hot from it's 50 Volt
  8. PeterD

    PeterD Guest

    Nothing beats a reply that is posted by someone who has no clue what a
    Hallicrafters S-38 receiver is! (Hint: think tubes)
    The 8 ohm speaker will work just fine.
  9. EpsilonRho

    EpsilonRho Guest

    If you are really worried you can had a 8 ohm power resistor in series with
    the 8 ohm speaker.
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