Also, remember that the TV that came in Computer Space is not just an off the shelf TV. It was modified to accept baseband video input. It was also powered from an isolation transformer in the game. If you find a standard TV, you'll have to modify it to work with Computer Space. Disconnect the video stage after the IF tubes, and feed the video into the grid of the video amplifier tube. I forget if you need to bias it. Similarly, Computer Space used the audio amplifier in the TV independently as well, so you'll have to disconnect that from the TV's circuitry and feed the audio signal into it directly as well.