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need to get a watt meter hooked up to then go the where the final is and look aroung for a tuning slug marked L38 and that is the baby you have to turn in order to power down this radio.
I would say a bad or cold solder joint on board somewhere. Bad quality control. Might flex radio chassis slightly while keying? A tooth pick and hours of probing around switching area on board and the pa section till problem found.
Don't get crazy into mods. Some are good some are bad.
Really all you want to do is a peak and tune on it. The cobra 148 has great audio already. The most I would do to it is turn up the modulation all the way, and the AM power, then put a swing mod in. That will get you max wattage. 2 watt dead key.
Talkback is only necessary if you are going to be putting an echo board in so you can hear how the echo sounds.
try adjusting the L36,L38 to the highest reading on the external meter and then adjust VR10 TO 4 watts. If this doesn't cure the problem, you have a weak final transistor. Good Luck
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