Have my vintage Dual Cl - 160 Speakers died?
A few months ago I picked up a pair of rather funky vintage speakers from a vide grenier (barn sale) here in south west France where I live.
The speakers a mint pair of early 1970's vintage Dual Cl- 160 speakers (4 ohm) have been running nicely in conjunction with my long term Incatech Claymore amp.
The Claymore has more than enough clout to drive the Dual's comfortably and the sound and tone is lovely. That is however until the other day when I put some music on and the speakers sounded terrible. Really muffled, and like they were hardly being driven?
At first I feared for the amp, but after connecting up my old pair of Mission 731 speakers, it confirmed the amp was fine (phew!)
I then decided to open up the cabinets on the Dual's and have a look inside. All the wiring looked fine and the soldering looked okay. I put the cabinets back together and connected up to the amp again and played some music...still the same problems. As the grilles were off by accident I put my finger against the edge of one of the four tweeters and suddenly the speaker sounded as it should with the woofer being driven correctly. I tried this same thing on the other speaker and lo and behold it also sounded fine if I held the tip of my finger against the tweeter??? In both cases it was the same tweeter, the top left one. As soon as I removed my finger the sound died back to a dull, flat mush?
What the hell is going on? Is this likely to be a capacitor related problem? I don't see how touching the edge of the tweeter solves it? Do you think it is fixable? Thoughts appreciated?