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A couple more items were also changing in the late 1950s.
1. There were more multi-function tubes being developed such as the compactron and many 9 pin dual section tubes. Where a TV previously had a seperate tube for the sync seperator and video amp, one now might be used.
2. Higher gain tubes were being introduced. Where a TV might of had 3 IF stages (some had four), in the middle 1950s, by the mid 1960s, many B&W sets had only two IF stages.
I suspect that these also contributed somewhat to declining tube sales (in raw numbers) in the 1960s.
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