Discuss The Viv Lab Rigid Arm

Dear @intactaudio : want to give you an example of two Löfgren A calculations where even that the EL of the tonearms is different an even that in both the overhag ( obviously ) is different the null points in both tonearms have the same value ( you can check in any net calculator by your self . IEC standard. EL/overhang are two of the parameters you mentioned in your posts:

EL 250mm.: overhang 16.5mm. null points: 66mm and 120.89mm.

EL 305mm: overhang 13.37mm same null points.

Obviously that the off-set angle is different too in both tonearms.

R.

@rauliruegas 

for some reason you introduced this particular tangent in response to me simply mentioning in order to get two null points both overhang and offset are required.

In this thread on feb 14 you wrote:

Anyway, for me the VIV/underhung issue is exhausted and at least for me useless to follow.

yet you still are active providing a distraction to the topic at hand.  Next can we expect you to explain how the circumference of a circle divided by 2X its radius will always equal 3.1415?  It does not matter what the diameter is, it can be 10mm or 32 miles, Pi will be the answer. 

dave

@rsf507 Right, I meant after adiusting the counterweights, I always return the arm to its rest before taking a measurement. Then I know the armtube is centered in the fluid bath.

@intactaudio : " for some reason you introduced this particular tangent in response to me simply mentioning in order to get two null points both overhang and offset are required. "

Yes the VIV issue is useless for me but I return here because you posted totally wrong about tonearm alignment. All your statements about are totally false and Agon threads are reading for several audiophiles that can’t " learn " from you wat’s ( again ) a FALSE information.

In the last 80+ years no one never questioned Löfgren A equations, NO ONE but you. Go figure ! . and from your posts you not even make the calculation using the Löfgren equation I linked, incredible  ! ! !  you follow posting about.

Yes, I did it.  Btw, any one of you already did it using IEC standard?

Now it’s really enough on the alignment issue where no one needs overhang/off-set angle to determine null points, only needs most inner/outer radius exactly as Löfgreen stated 80+ years agoin the linked formula.

R.

Dear friends: No one yet?

Here I go to null points calculation according with what I posted .

R1: 60.325mm.     R2: 146.05mm      IEC Standard.

First the numerator in the formula:

2 x 60.325 x 146.05 = 17,621

Now the denominator that has two elements.

First one :

1 - 1/1.4142 = 0.2929 x 60.325 = 17.669

Second one:

1 + 1/1.4142 = 1.7071 x 146.05 = 249.32

Now the adds of both:  17.669 + 249.32 = 266.99

Solution:  17,621 / 266.99 =  65.998mm

That's the value of the inner null point in the Löfgren A alignment and coincide with the net calculator for both tonearms EL I posted.

As any can see it needed only most inner/outer groove radius and nothing else.

R.