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Maco 750

Discussion in 'Amplifiers' started by donemad, Sep 12, 2011.

  1. donemad

    donemad Active Member

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    Anyone know the value of the resistor that ties to the input from the radio where the jumper goes? This one is burned. Looks like may-be someone tried to drive it.............Thanks for any help....


     
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  2. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    #2
    Last edited: Sep 12, 2011
  3. donemad

    donemad Active Member

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    #3
  4. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    Your welcome, The CB tricks site has a good library of amp, antenna, and radio information.
     
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  5. donemad

    donemad Active Member

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    750 maco

    Also there is a jumper that runs from pins 2 to pin 6 on the pre-driver and the other two drivers that connect to the finals, but I can,t seem to see what that is! Is it a resistor or coil? .....talking about the 47 ohm, what wattage is it? Also that resistor or coil looks like a 22ohm resistor, but what wattage? But it may be a coil, can,t tell, it is burnt to bad.........thanks for any help
     
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  6. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    Schematic does not give me wattage for the resistors, 1 or 2 Watt would be a safe bet.

    the 22 thing is a choke, 22 microhenry choke most likely, do you see how the 22 symbol is different than the 47 resistor symbol?

    http://www.cbtricks.com/Amp/maco/maco_750b/graphics/maco_750b_redraw_sch.pdf

    Link to better schematic, first one had some flaws in it.

    I can not tell for sure but if it is a 22 thingy it is an choke on the pins two and 6 most likely. Maybe some other member will post who has a Maco 750, I have the baby brother the Maco 200 sitting on the shelf in the shack.
     
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  7. SmackDown

    SmackDown Active Member

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    donemad can you take a good well lighted pic and post it ? It will help.


    3's
     
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