Pretty much all they used back then for TV cabinet veneer was walnut or mahogany with tinted lacquer to give it some color.
You might be surprised that raw mahogany veneer typically looks like this. Not much red at all.
Here are my best guesses.
zenith porthole top - red manogany
olympic - brown walnut
ge 12t6- hard to say from this photo. maybe brown walnut or brown mahogany ?
motorola - hard to say from this photo. maybe red mahogany ?
emerson 644B - brown mahogany
Now as for Howards. I use mahogany (redish brown) or walnut (brown). The cherry is very red and the dark walnut too dark for any of my sets. When in doubt, use neutral. It will shine up the old finish but not add any color at all.
Here is there color chart:
http://www.howardproducts.com/prod-restor-a-finish.php