If you are only using one camera, you can still use these without a time base corrector or blackburst.
Cameras have an inherently stable signal when they are live. They don't when playing back from tape though.
If you have a digital camera, like DV, HDV or one of the SD card based ones, you can usually even use them even from recorded footage. They don't have the same problems with the tape mechanism skewing the video timing.
You don't need anything else to get to tape, the output of the genlock will be your final output, so that should go to the tape and your genlock has very high quality output.