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In Reply to: RE: For anyone who thinks the AT33PTG needs a light arm posted by Audio Fan on October 09, 2007 at 10:03:51
I am using the AT33PTG in an ultralight AT1120 tonearm (3-5 g effective mass), and it works great. I am still breaking in the suspension (15hrs), and will check the resonance frequency once it reaches 20 hrs. I'll report back my findings. I expect the resonance frequency to be ~14 hz.
Charlies824
Follow Ups:
The AT33PTG that I tested had compliance at resonance of 25 x 10 -6 cm/dyne. If yours has similar compliance then its system resonance will be no higher than 10-Hz in your low mass tonearm.
I suspect the other person's cartridge in the heavy headshell has a resonance of 4-Hz, which the HFNRR test Record cannot measure because it does not go that low. The second harmonic of 4-Hz is 8-Hz. My guess is that the 8-Hz test tone on the HFNRR test record is triggering the 4-Hz arm-cartridge resonance.
At any rate, if you try to measure arm-cartridge resonance in your system, I would recommend finding a better method than using the HFNRR test record. That test record is really pretty worthless as far as I'm concerned.
Best Regards,
John Elison
I was mostly just guessing based on the HFN test record results I got for Shure V15VxMR, Grado Red, and Denon 301II cartridges on this arm. Since the 14 Hz HFN frequency is really 12 or so Hz, your calculation of no higher than 10 Hz sounds about right. I'll let you know.
Charles S.
What do you think of A-T supplying the AT333R with a high mass headshell?
> What do you think of A-T supplying the AT333R with a high mass headshell?
Probably just a marketing gimmick. It happens all the time.
In 1983 I bought the top-of-the-line Ortofon moving coil and it came with a beautiful 10-gram magnesium headshell. The cartridge itself weighed 11-grams. An engineer at Ortofon said to dump the headshell in the garbage and mount the cartridge in a low-mass SME III tonearm. That's why I bought a Thorens TD-126 Mk III with factory integrated SME III. I played that Ortofon MC-2000 for 10-years and it was the best sounding cartridge I've ever owned. It had an 8-Hz arm-cartridge resonance in my SME III.
Best regards,
John Elison
But you didn't try it with the 10g headshell. Lots of people used Ortofon 2000's in high mass arms with no problem. The reason that low mass arms were virtually dropped from production in the eighties is that medium and high mass arms sound better. Even SME went over to medium mass.
> Lots of people used Ortofon 2000's in high mass arms with no problem.
I'm talking about the original MC-2000, which was high-compliance and designed specifically for the SME Series III tonearm.
need to get rid of those headshells.
Do you really think they'd supply a headshell that would compromise their top of the line cartridge?
use that headshell. Very little I would guess. About 80% of the people in vinyl asylum have arms with integrated headshells, like VPI, Rega, SME, triplanar, etc.
It's like buying a $2500 cd player that includes 99 cent interconnects and powercords, or a $60K BMW that has cheap all season radials.
Life is too short, stop worrying about it.
> > I'll report back my findings. I expect the resonance frequency to be ~14 hz.
Although I'll be interested to hear your results, that doesn't address my point. I don't believe your arm has a removable headshell, but let's pretend for a minute that it does. If you had ordered an AT33 Reference instead of a Prestige, you would have received the matching headshell, which weighs 23 or 27g mounted. If you used the matching AT headshell, your 5g arm would have an effective masss of about 25 or 30g. Yet in the Vinyl Asylum, the common advice is not to use an AT33 in a medium or high mass arm. My point is, obviously Audio Technica does not agree that the AT33's need a low mass arm.
I can only speculate that they value structural integrity more highly than they value low mass and a resonance in the theoretically ideal range.
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