Newbie's First Questions RCA TS 721 Restoration

[Chris K]

Originally Posted by Penthode

Did you follow my instructions to set the local oscillator? What did you find?

To facilitate injecting video directly you will need to build a 75 ohm interface. It could be connected to the grid of the first video input stage. Then you could inject audio to the volume control. It will take a bit of fiddling as you have to ensure the video polarity is correct.

It appears you were very close connecting by the antenna. What happened?

I need to go on ebay and get a radio with a signal strength meter. I thought I had one but I didn't. Couldn't work on the oscillator just yet. I did get an RF modulator that injects excellent, clear video in my Zenith B&W TV into the antenna from my computer's HDMI output and I fed that into the antenna on the RCA and I got a decent picture...a little snowy but decent...but still no sound.

Could I go into the 12AU7 grid with a composite video signal? The modulator I got has RCA video and sound outputs and I can mount 2 RCA female connectors on the back of the 721 chassis and run the signals to the volume pot and the video amp grid. But if this TV has some funky video system, this might not work.