[ARC Tech-109]

More progress on the video inputs today and the sync separator has pulled everything together, I had to do an NPN inverter on the composite sync line from the LM1881 and feed that to the horiz AFC while feeding the vertical sync to the vert section at R515 thru an 0.1uf cap. It's enough to trigger the MV and has a 2/3 swing on the vert hold control before it breaks lock.

The actual video input circuit is Phil Nelson design but with 500 ohm pots on the 12AT7 cathodes and 0.047uf cap between the stages, it then feeds the 1st video amp of the Magnavox which now runs a 6GH8. The 500 ohm pots help get the levels spot on without overloading, not every set will need the high drive level and these will eventually be replaced with fixed values once I have them dialed in.

I'm still dealing with the banding and DC restoration issues and not exactly sure how to solve this. It's very similar to when the RF AGC is too high.