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I dont see how an estimate could be done with out checking it out. You could have a bad CRT, bad flyback, in which case it going to be expensive, or it could be a simpe tube issue in which case its just put a NOS on in.
You also have to decide if you want to repair or restore or a little of both.
You can do the bare min (like the tube replacement) and it may be ok, but will fail quickly as some other old part that is prone to failure (caps). this can do more damage that will end up costing more money.
I assume the 400$ is just a basic recap estimate, maybe a tube or two. With out checking at least the CRT its would be very hard to nail it down.
I assume you found a vintage repair shop, to give you that estimate.
IMHO your best bet would to be to find a vintage tv/radio shop (could be hard to do) or hopefully a local member here to check it out in person and give you a better idea of what the problems could be.
The fact that you get sound clears the power supply and the tuner/IF so you about 1/2 there. I would suspect a bad horz out prob from a leaking coupling cap (which is why you dont want to turn in on anymore until its fixed).
if that is not it, then move on to the flyback and HV rectifier. All this is assuming the CRT is not dead.
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