[N2IXK]

After testing the composite video and line audio input circuitry, I went ahead and did a permanent installation. I drilled 3 holes in the lower left area of the rear chassis skirt, to accommodate an RCA jack for audio input, a BNC jack for video input, and a small DPDT toggle switch to select between line input or off-air operation. The external audio gets injected right into the top end of the volume control., and the external video gets injected into the grid of the 1st video amp tube, via C103. Will label the added jacks and switch before final assembly.

I didn't see any need to have the input selector switch remove B+ from the IF stages in line input mode as the "Broadcast News" article shows. There doesn't seem to be any appreciable signal bleedthrough from a strong RF input signal when the line input is selected. This saves the need for a third pole on the switch, as well as the need to install a large wirewound resistor to replace the load normally drawn by the IF tubes and tuner.

Next up will be to try tweaking the off-air audio in so it tracks better with the video. Got started on the cabinet work this week, as well. Cabinet was already stripped and veneer repaired/replaced, so the set essentially just needs a new finish put on, a missing safety glass replaced, and a few bits of metal trim polished up.

Set is completely missing the "jewel" for the pilot light below the speaker. It wasn't in the box of knobs and loose parts that came with the set. Does anyone have a good picture of what it looks like, or, better yet, a spare unit they would part with? Looks to be about a 5/16" hole that it would mount in.