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The sheet beam tubes have a common control grid and cathode and 2 plates and 2 beam deflection grids...you put the chroma signal from the band pass amplifier into the common grid, and then the 3.58 mhz reference signal at different phase angles into the beam deflection grids. (sometimes the chroma signal is introduced at different phases into the beam grids and the 3.58 signal applied to the common grid).
The color difference signals are then taken off of the plates of the tube...I think there is enough amplification in the tube that these signals can go right to the crt grids without another amplifier stage between.
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