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The RCA likely uses a CTC89 or 92 modular solid state chassis. They were decent sets; but, the CRT's tend to be weak by now and they can cause some difficult problems in the power supply and horizontal sweep circuits. Still a farily common set. Really nothing special. The main solid state sets you'll want to look out for are the Zenith Chromacolor's and Chromacolor II's, The early Motorola / Quasar "works in a drawer" sets from the late '60's, The early RCA TransVista and XL100 sets (CTC40, 44, 48, 68 etc), and the Sylvania GT Matic sets of the '70's. BTW, the Zenith sets almost always have good CRT's, even 35 years after they were made!
The Magnavox is an early '60's tube type B&W. Sound but no pix could be caused by many faults. You may have a horizontal sweep failure, a video ouptut circuit failure, a toasted CRT, or a combination of the three. That one will almost certainly need all of it's paper and electrolytic caps replaced before it will work properly.
Don't invest too much in these; especially if you don't know what condition the CRT is in. Sometimes, a weak CRT can be brought back to life with a quality CRT rejuvenator; but, it's much better to start off with a good CRT to begin with. Rejuvenation is usually only temporary and will get you by until a suitable good CRT comes along.
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