Angling for 90° - tangential pivot tonearms

[directdriver]

Terrific images of the innovative Schröder LT tonearm. Notice there is NO offset at the headshell. Also notice the magnetic guiding system under the base plate. If I'm interpreting the pictures correctly, looks like a pivoting armature holding a magnet following a curved steel rod path and therefore no mechanical contact.

Frank Schroeder is one clever guy!















More images on post #443.

.

[stoN_Cold]

Classic ton arm with magnetic antiskating.

Regards zeoN_Rider

[directdriver]

Originally Posted by zeonrider

Classic ton arm with magnetic antiskating.

It has nothing to do with antiskating.

[directdriver]

On post #61, I posted about a WKarlson tonearm that I am still not sure if it's a tangential pivot tonearm like the SchuchTronic arm. But there are striking similarities in using strings, round headshell, and aesthetics. Both look like Frankenstein but fun.

Compare below.


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SchuchTronic tonearm

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WKarlson tonearm

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[directdriver]

More pictures of the wacky SchuchTronic tangential tonearm from a German website.

[RCruz]

Originally Posted by directdriver

Terrific images of the innovative Schröder LT tonearm. Notice there is NO offset at the headshell. Also notice the magnetic guiding system under the base plate. If I'm interpreting the pictures correctly, looks like a pivoting armature holding a magnet following a curved steel rod path and therefore no mechanical contact.

Frank Schroeder is one clever guy!















More images on post #443.

.

Finally I understand the principle.... quite clever... as the stylus moves inward to the center of the platter, the magnet pulls the arm base following the curved metal, causing the pivot to change position

[Joachim Gerhard]

I heard that arm at Franks home.
It sounds awesome and is a perfect example how simple it can be.

[RCruz]

Did you also listen to the Thales tonearm ?

[directdriver]

Originally Posted by RCruz

as the stylus moves inward to the center of the platter, the magnet pulls the arm base following the curved metal, causing the pivot to change position

Exactly. The clever thing is that it never had to use any linear bearing or any contact type of bearing, hence the low friction. The shape of that curved metal is crucial to the tangential accuracy, though.

[directdriver]

These are patents suggested in a German Forum that Frank Schröder (berlinta) participates for reference.



<Patent US3476394 - TRAVERSING MECHANISM FOR PICK-UP TRANSDUCER ARM FOR DISC RECORDS>

<Patent US3850435 - GRAMOPHONE PICKUP GUIDANCE MECHANISMS>

<Patent US3059934 - URMENYI>

<Patent US4722080 - Transducer arm assembly for disk play-back machines>

<Patent US2585396 - GKAMOPHONE TONE ARM MOVING DEVICE>

<Patent US2192464 - ACOUSTIC DEVICE>