22-03-2021, 08:57 AM
Same problem with the damping foam that was used in headphones. Two pairs of Koss phones dating from the 1970's that I bought, it had turned to liquid tar. Hell of a mess to clean up. Replaced it with some regular loudspeaker synthetic damping stuff (used to be called BAF wadding). Fortunately apart from the mess, there was no damage to the drivers.
Craig
Craig







