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Few Philco TVs had chassis-mounted CRTs for good reason. There was far less factory and service breakage and lighter to handle. The 1956 TV 440/444 had chassis mounted CRTs and were a nuisance to handle. After that, only portables came that way.
Most shops had test set ups so firing up a chassis in the shop was no problem and took up much less room.
Yes, a bad video detector can cause a raster with no sound, no picture. A simple ohm meter check will confirm a suspect.
Don
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