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In Reply to: RE: target arm/cartridge resonance when playing 78s? posted by John Elison on May 27, 2017 at 12:17:59
I would think he would want lower, but even though I own an play 78's, I am not an expert. The nice thing about the Technics is that there are a lot of headshells that have removable weights (Stanton for example, that make it easy to try. The weights come with the headshell, and screw onto the top. This makes it easy to let your ears decide.
Dave
Follow Ups:
Why lower?With the record spinning at 78 RPM, wouldn't the warp tones be higher and need a higher resonant frequency as to not get excited by those warp tones?
As I understand it, a 33.3 RPM record has warp tones at a max of 5Hz and the lowest frequency cut in the groove of 20Hz.
Having the arm/cartridge resonance set to 10Hz means that that resonance is one octave away from (above) the 5Hz warp tones and one octave away from (below) the 20Hz music in the groove so that neither will set off the 10Hz resonance of the system.
With the record spinning at 78 RPM I calculate, for the same warp, the warp tone would be 11.7Hz. (78 / 33.3 = 2.34 5Hz X 2.34 = 11.7Hz)
If the arm/cartridge resonance were set to 23.4Hz the it would be one octave away from those warp tones.
If there is no music lower than 46.8Hz cut into the groove then the arm/cartridge resonance would be at least an octave away from that.
Am I thinking about this wrong?
Thanks.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 05/29/17
Your logic sounds good to me. Unfortunately, it will be virtually impossible to get a higher arm/cartridge resonance frequency than 14.25-Hz unless you completely change the tonearm.
The arm/cartridge resonance frequency in a 5-grams SME III would be 17.7-Hz and a 3-gram Infinity Black Widow would yield an arm/cartridge resonance frequency of 19.3-Hz. That's about the highest arm/cartridge resonance you will get.
Why don't you just try it in your Technics tonearm using a Technics headshell and see how it performs with its 14.25-Hz arm/cartridge resonance frequency? If it plays okay, so be it!
Best regards,
John Elison
.
Have Fun and Enjoy the Music
"Still Working the Problem"
Perhaps adding the tonearm damper that K.A.B. sells might be ticket here.
That's always the ticket! I would never use a tonearm without silicone fluid damping. It's a requirement!
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