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Jelco SA750 D optimal cartridge alignement

Hi,

I have just installed a Jelco SA750 D with an AT 150mlx on my technics SL-1210 using the TimeStep armboard. Spindle-Arm centre distance is 214 mm.
The mounting template supplied shows the stylus tip about 2mm behind the front of the headshell yet it is impossible to set any of the various null points if the stylus is put here. I have settled on the Jelco null points of 59 & 112.5 although vinylengine also lists different null points for Stevenson, Baerwald and Lofgren B. Is there any received wisdom that one is "better" than the other and why does the stylus point not match the OEM mounting template even when using the Jelco default null points?

Regards
Steve
worrasf

Showing 2 responses by worrasf

worrasf OP
8 posts
 
Thanks - yes it seems quite an "issue"
FWIW I spent a few hours this evening experimenting with various null points - Stevenson, Baerwald, Lofgren B and I could not get any to line up at both inner and outer! However, the Jelco OEM null points of 59.063 & 112.507 do line up and what's more in this position the stylus tip is exactly aligned with the Jelco arm template position! I'm committed to a distance of 214 mm as that's where my (very expensive) armboard has put it. Looking at the distortion curves on vinylengine for all 4 settings the OEM ones look an OK compromise to me.
So it certainly looks like 214 mm is not the best mounting distance for this arm.
Regards
Steve
worrasf OP
8 posts
 
I have just ordered a custom MintLP tractor from Yip at mintlp.com specifically for 214 mm and am assured I can align my AT 150 MLX to Baerwald so am hopeful. FWIW this morning I installed my Astatic MF-100 in the Jelco - again to OEM null points and I am delighted with the result - tracks band 3 of HFN test disc no worries and sounding stunning.
Regards
Steve
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