A novel take on a Uni-pivot arm

[low pitch]

Today I rigged up my supa straight arm on a SME slide base I got on aliexpress.  It has nice machined parts.   I greased it up with  'Vapo Rub / Vaseline to give it a smooth well damped slide action.  I made a bush for hte TA and a short handle to adjust the slide position on the fly. 

The slide has 30mm travel which is perfect for a 300mm tonearm, which requires about 27mm movement towards the spindle to stay in tangent across the record.   I start it full back and move it fwd  two or three times ending up full fwd before the end of hte side.  On the end is a Denon SL-1  and  the sound is best I ever heard out of it. It's a hard cart to please.

[TransFi]

The question is how does it sound when you dont move the pivot. Is there an optimum position for that?

[low pitch]

One time I forgot to move it and it started jumping the groove somewhere before the end of the record!  Fine once I advanced the arm.

My impression with the other arm is it loses focus when it is far off tangent.  Starts to lose depth, the subtle good things.  Why would you accept such gross discrepancy from the cutting head when you can just move the arm fwd a bit now and then...worth it for the great sound you get.

[SUPATRAC]

Very interesting experiment!

[gninnam]

Sounds like you need to fit a servo to it so you don't have to do it manually.

[Adelmo]

Sounds like you need to fit a servo to it so you don't have to do it manually.

Hi,

To me sound like my clone of the Schroder LT tonearm. Certainly sounds good as it tracks tangent, has no offset or no underhung.

Picture of the position at 1st track



Picture of position at the 5th track



A simple tools let you check how close you are from the tangent tracking

Rgds

Adelmo