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I am not familiar with the solid state sets, but have seen many a tube set with buzz in the audio. These sets used the ratio detector and the quadrature detector which are required to be in very good shape and aligned very well to reject the amplitude modulation in the video.
I have a couple of B&W sets with the Armstrong limiter/discriminator setup. I have not restored these yet, but am very curious as to how these will work in a TV. Suprsingly, considering the fighting between Sarnoff and Armstrong, these sets are 1950s RCA sets. I have several Zenith radios from the 1950s and the limiter/discriminator setup works very well in these.
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