I'm having problems with my 60's Unidyne III again. I get a big drop in bass response. The only way to cure this is to pull the black plastic top end around the capsule away from the body slightly. It then sounds great but after a few minutes slips back. I wonder if there is a loose connection? I've peeled off the silver label around plastic surrounding the capsule, expecting to see some screws but there are just brass pins.
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