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In Reply to: RE: Nude AT-OC9 posted by ringwear on October 29, 2014 at 14:46:21
From the picture it looks like you have it mounted on an SL1200 with stock Technics headshell?
Is it the original OC9 with elliptical tip or the ML? The ML is very fussy with arm height as you've probably already found. The stock Technics headshell are very variable in both plug mounting height and angle - the arm height is calibrated assuming a 0.4° upward tilt of the headshell which compensates for the cantilever deflection. Some headshells are set at 0° which straight away gives you a 0.34mm error in arm height before you compensate for the plug mounting error.
If your sound was "thin" it may be that your arm height is too high. My cartridge is very balanced tonally and I haven't found the cartridge to be inherently bass shy.
You may find it beneficial going to a slightly heavier headshell like the Stanton H4S which is ~9.5g. The LF resonance of my OC9ML/II in a Stanton headshell is just slightly above 8Hz, giving a very well balanced sound and satisfyingly tight but extended bass which extends smoothly to the upper frequency extremes; the FR is essentially ruler flat from 1kHz to well past 20kHz if you've seen the white noise response that I showed John.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
Follow Ups:
Yes, the height has to be quite low on my rega arm to get the cartridge body parallel to the record surface as per AT's setup instructions. I have the Riggle VTAF adjuster so I was able to get the correct height. Once this adjustment is made, the sound is not thin or bright at all.
Edits: 10/29/14
it is the original elliptical. and i did have the arm high and dropped it. that may have contributed some, you're right.
i did have some more weight on there but it seemed lose air. i dropped the weight and it seems to respond better - but i have the damping trough, as well.
I have a OC9ML/II that worked just fine on my Roksan Artemiz arm but I'm curious to try it in the heavy AT magnesium (?) headshell (I got recently) play it on my Pioneer PL=570.
Just got to get motivated lol
Does you Pioneer arm require the normal 52mm overhang alignment? You may have difficulty with the AT headshells getting the correct overhang. The MG10 and MG100 which I have all come up slightly short on the front holes until you shim it with appropriate gaskets on the plug.
Also, I would be very careful about going much higher than 10g depending on the effective mass of the Pioneer arm. The Technics arm is 12g effective mass. With a 9.5g headshell, the LF resonance was right at the bottom end of the "ideal" range.
If you go for a heavier headshell like the 13g or 15g AT, then you risk negatively impacting the sound due to the LF warps causing the cantilever to start bouncing around at a greater amplitude than with the stock headshell which will cause poor tracing and tracking.
I was recently playing with a Denon DL301 which is a fairly high compliance design. In the Stanton headshell, the LF resonance is about 7Hz. Once I remounted it in the stock headshell which is 2.5g lighter, the sound is much cleaner with really well defined, tight but very extended bass.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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