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Here are two video input adapters
The left one is for a Heathkit GR2000 and the right one is for an RCA CTC74. Both are built on 2x2 circuit boards and attached to the IF module with silicone rubber. They output to the first video amplifier.
The Heathkit adapter uses a MAX405 video op amp and the RCA uses a compound pair of transistors. Both are configured for a 6X output. Both work equally well.
The choice for the video op amp was made because a bipolar supply was available in the Heathkit but this was not the case in the RCA.
The cable exiting the adapters is the video input cable.
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