03-28-2021, 02:13 PM
I see your posting of an article about refurbishing a horseshoe magnet pickup. I wish I had that 35 years ago when I acquired an Atwater Kent model 75 radio/phonograph. A radio technician I knew got the chassis working and the radio still sounds great. The pickup was in terrible shape and all I knew was to try and replicate what I saw. I found a coil and mashed it slightly in a vise to fit the cavity, replaced the rubber damper and it worked! I knew nothing about rubber or coil specs. A couple years ago it was sounding sick (I rarely play it except for fun experiments). The rubber damper seemed fine, and I used heat sink tubing for the cradle sleeves. I had always been concerned about the heavy weight of the magnet, and it seemed weak. I didn't know about using a "keeper" when I removed it for the other repairs. Then I thought of trying powerful button magnets. The result was almost ear shattering volume! More experiments and I now use just one little button magnet on each side (the polarity must be right or you won't hear anything, plus the pickup is a lot lighter. I've tried minute adjustments to the magnet screws and right now the volume and frequency response seem good but there is a little distortion on the loud passages. I was astounded by how loud it got when the cradle was more loose. Any suggestions on the distortion? Really not bad, just noticeable.