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Old 09-12-2011, 08:36 AM
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Default Maco 750


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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Old 09-12-2011, 08:58 AM
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If it is the resistor on the keying circuit input looks like a 47 ohm here is link to schematic.

http://www.cbtricks.com/Amp/maco/mac...o_750b_sch.pdf

Last edited by wavrider; 09-12-2011 at 08:58 AM. Reason: fat fingers

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Old 09-12-2011, 10:03 AM
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Quote:
Originally Posted by wavrider View Post
If it is the resistor on the keying circuit input looks like a 47 ohm here is link to schematic.

http://www.cbtricks.com/Amp/maco/mac...o_750b_sch.pdf
THANKS WAVRIDER.......I had it but it was unreadable.......

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Old 09-12-2011, 05:46 PM
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Your welcome, The CB tricks site has a good library of amp, antenna, and radio information.

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Old 09-21-2011, 01:55 AM
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Default 750 maco

Quote:
Originally Posted by wavrider View Post
If it is the resistor on the keying circuit input looks like a 47 ohm here is link to schematic.

http://www.cbtricks.com/Amp/maco/mac...o_750b_sch.pdf
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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Old 09-21-2011, 06:30 AM
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Quote:
Originally Posted by donemad View Post
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
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/mac...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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Old 09-21-2011, 07:21 AM
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donemad can you take a good well lighted pic and post it ? It will help.


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