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I quickly jump in and answer for you with my assumptions. From some of the footage I've seen the late 60s and early 70s was the period when studios upgraded their broadcast equipment which the TK-41s were upgraded to the TK-44 which was put into production in 1968 I read. The TK-44s were the worthy successor for the TK-41, the TK-42 and TK-43 produced inferior pictures to the TK-41. So that show would of upgraded their gear during the 1968-70 period.
In the case of the Andy Williams Show which I got 105 minutes worth of rock music clips in a trade, that show used TK-41s from 1962 to about 1969/70 and upgraded to TK-44s from around 1970 onwards. The TK-41s and 44s were clearly seen in the clips. It looks the TK-41s gave a richer colour than the TK-44s on the show.
The TK-41s give blue/purple/red halos around spotlights and shiny objects reflecting spotlights whilst the TK-44s gave pinkish comet tale effects around spotlights.
Cheers
Troy
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