‘Boat Anchor’ is an affectionate term used to refer to old tube gear, primarily radios and test equipment.
This guy has a great site dedicated to his collection & adventures in restoration. I didn’t see any Tektronix gear, but hey, no one’s perfect.
Speaking of boat anchors, I stumbled across this site that attempts to humorously quantify the relative beauty of these old relics:
BABE (boat anchor beauty evaluation)