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Cobra 2000gtl Unmod and Repair

Mustangtc65

New Member
May 31, 2026
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Hello, my name is Ty and I am here for guidance. Few weeks ago I purchased a very nice, ascetically, 200gtl. I am new to electronics, but I am learning and searching multiple forums. Everyday I read and reread threads and things are starting to make more sense. Currently I have a nice multi meter and soldering station. My 2000 has multiple mods. It has echo/talkback board, clarifier unlock, power mod, channel mod, and 4 pin mic. Luckily no wires were cut for the 4 pin mic mod. I was able to remove it and now have the correct 5 pin. there are many wires and components clipped. I have a page full of notes of issues that I see, but want to keep this first post short so not to get overwhelmed. The capacitors look to be original. All are Rubycon brand, light and dark blue. The radio receives great from what I can tell. The first issue I would like to correct, maybe multiple issues causing, is the radio has a constant tone/hum in AM only and the "On Air" light is always lit. It is audible through both speaker and phone jack. Does not increase or decrease with volume. It has a very low transmit. I am barely able to hear transmit on another radio only a few hundred feet away. When I key the mic there is no reading on the meter. Goes to flat 0. Speaking into the mic does move the meter normally. I have removed the echo and talkback board. The tone/hum was there before and after the removal of the board. I would like to remedy these two issues so that the radio is usable while i work through the others. I will do my best to answer questions and post photos the best I can.
Thanks, Ty
 
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