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RE: For anyone who thinks the AT33PTG needs a light arm

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

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