no transmit but shows good output

If it has a PA switch on your CB you can plug earphones in the output on the back,, to check your MIC.

"Does it have a meter on it? If yes, does the meter move wen you whistle into the microphone? (that is rude on the air but for lack of test equipment..)

Put a small AM radio right near the antenna and talk into the mike. Usually it will accidentally pick up the voice signal and you should hear it. It may squeal if the radio is loud and the mike picks up your signal."

In this case sounds like bad mic or mic gain turned down or the audio section of the transmit board is open

The only thing with saying the finals have blown is that the original poster indicates the meter is still swinging over on tx but nobody hears him. If the finals had blown, I have never known a CB radio yet that still swings the meter on a key, the needle always stays dead or incredibly low once the outputs are shot. CB RADIO INFORMATION I would be concentrating on the antenna side of the equation, providing you even have one ?

"With the speaker side down, set the radio on a flat surface. Remove the microphone plug from the radio. Look at the socket the mike plug came out of. You will see a four pin connection. Look closely at the four pins. One of them has a small bump or notch near it. To the left of that notch is the ground pin. To the right of that notch is the receive pin. Above the ground pin is the mike pin. Above the receive pin is the transmit pin.

With the radio turned on and the mike removed, take a small horseshoe shaped piece of wire and touch one end of it to the ground pin and the other end to the transmit pin. This will key the transmitter. If the needle on the meter does not move, you likely have a blown final. If the needle does move, you have a bad microphone or blown audio output IC."