[Penthode]

Yes I agree follow Kevin's route. However be aware of the process of adjustment of the local oscillator to bring the set in tune and yield a picture like my set.

First, the way the tuner is designed is the inductances are cascaded. That is when you adjust, it was originally suggested that you start with channel 13 and move downward. If you do not need the other channels you need not really need to worry except to be aware the reason you may not be able to tune channels 6 , 5, 4 and 3 is that there is something wrong with the tuner oscillator coils above these channels. Or there may be a bad tuning capacitor in the tuner.

I have found with each of my late 40's sets which had sat unused for decades that the whole chain was off and I needed to adjust the higher channels in order to bring channel 4 correctly within range. Study the service notes as they will infer the same adjustment process.

Be aware that if you adjust the screw slugs initially counter clockwise, you have the danger of adjusting them so they will drop out from where they are threaded. Inspecting the tuner, you may find someone has been there before you and some of the slugs are missing for some of the higher channels. That may be why you are not able to fine tune properly. It is always worthwhile inspecting the holes where the screws are to see if any are missing.

I always begin by adjusting clockwise until snug and the back off the screws. Follow my suggestion in my previous comment to find the correct response slope to place the carrier at 50% which is proper tune for best picture detail and where you will find the audio. If you cannot adjust the fine tuning to where the image begins to fade, means the local oscillator frequency is too high. Brass slugs are used which means in screwing the slugs lowers frequency.

To fix the video to make it sharp as well as retrieve the audio, you must get the local oscillator tuning right.