FR64s & Orsonic Av-1s Effective mass ?

Hi lewm

I have already tried the combo, original fr64s/ Decca Super Gold, and it is playing music in a way.
Vinylengine calculator with fr64s original headshell ( 35 EM) says around 7.5 hz. I am also using the " Decca pod" that adds maybe 5 grams. ( Do not have an accurate weight here that exceeds 5 grams now).
But when I tried the arm/ cartridge compability track at Hifi news test record the cartridge jumped straight into the next track:)
About the resonance track on Hifi news test record, I read somewhere that the results/ cutting actually is wrong!?
I also have an Ortofon test record I can try on later..
Your trick / calculate formula seems interresting. But if it is as easy as Raulirugas is saying...?

Hi Rauliruegas

Original fr64s headshell FRS-3 as far as I know weighs 20.6 gr.
Orsonic AV1-s weights 10 gr.

Difference: 10.6 gr.

Meaning EM clocking in at 24,4 gr?

Resonance frequency 8.8 hz
Thats a green light 👍

I don't know where to begin.   If VE says that the OEM FR64S + its OEM headshell have together an effective mass of 35g, that's a good place to start.  Then you have to add the weight of the cartridge and the screws and nuts used to hold the cartridge in place.  But you'd like to know the weight of the OEM headshell separately, so as to be able to compare it to the weight of the Orsonic, like Raul says.  And even then, the change in EM is not the same as the difference in static weight of the two objects.  (I don't know what a Decca pod is.  Perhaps it's something that goes between the headshell and the cartridge.  If so, the pod plus Orsonic might be close to the same weight as the OEM FR headshell.  The difference would be negligible, IMO.)  If it sounds good, especially in the low bass region, it probably IS good. If the calculated resonant frequency is 7.5Hz, that is not so bad either.  You might look here for some help: http://www.resfreq.com/resonancecalculator.html

This is a Decca pod:

https://www.divineaudio.co.uk/fit-deccapod-recalibrate-service-for-london-decca-cartridges

Dear @geddyen :  """ a tonearm with minimum degree of bearing friction and efficiente DAMPING. """

that's the Decca advise to the Super Gold owners. The tonearm and the after market headshell you choosed for your Decca cartridge goes against ( both. ) the manufacturer advise.

Your FR tonearm is a very old non-damped design. " Rings as a bell ". Your choosed headshell is an non-damped design too.
In both cases that's means a way higher distortions that a well damped tonearm/headshell design. 

In the other side its VTF mechanism "" rings as a bell "" too.

 If you have not other alternative to mount the Decca cartridge then make the VTF set up as if the tonearm design was not dinamically by design but static one, using exclusively the counterweight to make that VTF set up with the additional advantage that the counterweight will be nearer to the tonearm/bearing pillar.

 Unfortunatelly you own one of the worst tonearm and headshell designs in those regards.

Now, due that the vertical compliance is very low in the Super Gold could be better that the resonance frequency stay very close to 10hz and if posible in a diferent tonearm/headshell.

Decca manufacturer knows very well its cartridge designs and that's why they give precise advise on what kind of tonearm mate well with it.

Of course we can use any tonearm and the Decca  will " sound " but ( at least for me. ) that's not the priority but try to achieve the best quality sound/music performance level we can.

Regards and enjoy the music,
R.