I am about to purchase a Code 100 Head , all I have is a 4ohm 212 Cab. Is this okay to do. I know offically it is not, but for tube amps I've heard this is fine to do.

Hi. By mistake, I think I hooked up my 100 watt JCM 800 head to my 1960B 4x12 cab on mono with two cables. It's only recently that I figured out the right way to connect them. That's by plugging  one end to the 16 ohm output of my amp head since it's set to 16 ohms and the other end of the cable to the 16 ohms input on the right side of my cab. Will my stupidity affect the functioning of my amp head for the worst? It seems to sound and function fine now though. Thank you in advance.