But the best enhancers can make a visible difference. Use a video processor. Much more useful than an enhancer is a video processor which can improve the picture by correcting color, contrast, lightness, etc. Unless all your originals are perfect, a good processor can improve your results. Watch for copy protection.
Many commercial tapes have a special signal recorded in the invisible portion of the picture.
This signal is meant to react with circuits in your recorder to make copies look bad. The most common form is called Macrovision. If you attempt to copy a tape with this signal, the copy will flash and jump and will be unwatchable. Inc. 1370 Dell Ave.