I also live in a 1955 era house. Same lack of grounding. My grounding issue was so bad, you could feel low current levels on the metal faceplates of components.
My attempt at a solution was successful. I bought a $200 or so Panamax surge protector/line conditioner. No more "hot" faceplates. Couldn't say if anything sounds better due to the line conditioning, but I don't feel like I'll get zapped by my ungrounded audio equipment.