It’s sounds like “bad”, but with a shorter “a”, so like “had”

Although I guess “bade” is used nowadays as well don’t know how erroneous it’s considered to be.

You can here people use it here

www.playphrase.me/#/search?q=I+bade&pos=4

www.playphrase.me/#/search?q=bade&pos=4

Seemingly Americans in those clips say “bade” (rhyming with “made”) but Brits say “bade” (rhymes with “had”)