Anyone heard of this???

Yes, it was a linear tracking arm. I saw a few on thorens TD125 turntables. I've never known anyone to own one. I had heard that when they were working they were awesome.

Your friend indeed pulled out a Rabco. The one you describe is most likely the later model and was sold separately as the model SL8 E. It was powered by a dry cell battery, which would electrically cue the arm down to the LP and back up. There were two very fine "whisker" leads on either side of the arm, at the very rear. When the arm would go out of alignment (much beyond the required 90 degrees), a post brushing one of these whiskers would engage another small motor, and a bead chain drive would move the arm back into correct alignment. Proper adjustment of this arm was very difficult. Not only was it necessary to have everything extraordinarily clean for it to function properly, the hidden battery losing power could cause damage to the LP. I used one of these arms on my reference turntable for nearly two years, and have information as to mods, upgrade battery (faster response of cue and correction), and counterbalance and head shell corrections. The bad news is there are literally dozens of arms now that will out perform this unit. If you want to resurrect it for fun, I could possibly offer help.

M & K (yes, the woofer folks) were modifying these arms and for several years it was Absolute Sound's state of the art reference. All of the linear tracking arms of today owe their heritage to Jacob Rabinowitz, the RAB in Rabco. Gee, I'm giving away my age by remembering this stuff!

Yes all, that is the arm. It is powered by a "C" cell. I was not considering a rehab project myself, but after looking the thing over we decided it might be fun to put a little effort into rebuilding it. Thanks for the help. Albert, we may be in touch if we decide to pursue the rehab.

Thanks, Doug

Kudos to Albert. I'm kind of a "nostalgia" buff when it comes to older audio gear and do remember the basic arm design, i wasn't familiar with all of the info that you provided. Thanks for filling us in. I was told by others that had worked with that arm "way back when" that it was a good arm in its' day, but was EXTREMELY finicky and hard to keep running. Nonetheless, it might be fun to play with. I wouldn't start off with any of your valuable vinyl though : ) Sean
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