Back when I had a TT with a hinged dustcover, I would just remove the dust cover while I was playing. I never liked them and never played a record with the cover down over the table. If the cover was not removable, I would play records with the dust cover up. I had always heard it wasnt't the best thing to play a record wth the dust cover down on the TT (years ago, while I was growing up).
No More TT Feedback
I consider myself a fairly intelligent guy. I've been thinking my TT feedback problem was related to support vibration. If you have been following this saga, you will know I've tried spikes,foam, even built a separate platform (I needed that anyway) for my TT accessories and the TT itself. I was having a couple "Dos Equis" and I got this idea to add weight to the TT. As the record was playing, I carefully put down a cloth on my dustcover (I hear the high end tables do not have dustcovers) and put aprox 5 lbs of dead weight on top. BINGO! My vibration problem was non-existent. My dustcover is hinged in the back and the front corners were not completely touching the TT base. Therefore the dustcover and would build-up harmonic vibrations eventually being picked-up by the tonearm. Even with the cover open, it would still vibrate, so I never associated the cover with my problem. As soon as I added the weight, it made the dust cover touch and no more vibration/feedback. I tell you this running the risk of coming off as a fool, because I didn't want anyone else to make the same mistake.
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