Back in the day that kind of jack was the norm, most pedals that had DC jacks used them.
__________________
"What's more romantic than dying in the moonlight?"
P-Bass Club #466, Hollowbody Bass Club #29, Electro-Harmonix Club #1, Texas Bassists Club #61.
i modded mine with the super high end electrical tape mod. its kinda hard, but once you get the hang of it it will work great. step one: tape the hell out of it. the end.