Killing sibilance distortion - VPI & Jubilee

Hi Johnbrown,
you say...
>>> ... requires you to align zenith via the cantilever-not the cart body <<<

Well, yes I guess by only using the mirror from below, right?
It still can be tricky (that Jubilee's cantilever is tugged in-between two side-cheeks) and ever so often the cart body just happens to 'guide' ones (mis)judgment, YMMV.

Axel

Axelwhahl-All true. I was just reiterating what I'm sure you know (probably better than I) that one should never use the body of the cart for alignment, no matter which plane you're aligning. For instance, I often see VTA/SRA tutors telling people to 'level the tonearm'. While that may be useful as a baseline for further adjustment, it really has only a cursory relationship to the alignment one must pay attention to-that of the stylus in the groove.

Hi Guys,

I am definitely on board with aligning the cantilever, and not the cartridge body. I'm going to take a picture of the cantilever sitting on the MINT's null point.

Here is what Yip at MINT has told me about the 'tractor:

1. Mounting Distance, ie pivot to spindle distance is 223mm
2. Effective Length is 240mm
3. It is Barewald Algorithm.

I checked the mounting distance with a ruler. I don't have the skills or tools to get a super accurate measurement, but it looks like it's right on at 223mm.

My first step is going to be getting some photos of setup on the MINT, and confirming the VTF.

Hi Goatwuss,

1. Mounting Distance, ie pivot to spindle distance is 223mm
2. Effective Length is 240mm

So overhang => 240 - 223 = 17mm.
That looks ABSOLUTLY normal.
My SME-V e.g. has 17.8mm (Ja, ja, DerTonarm will love sat to se 1/10 of se mm :-)

This should suggest to me, that this Jubilee be most all underneath your head-shell ---- and it ain't!
So wei not is se qwesion, ja?

Axel

Hi Guys, I have some updates! ;)

a) verify that you've set the correct VTF

Looks good to me: VTF

b) try using absolute minimum anti-skate.

I've actually fiddled around quite a bit with anti skate. Mike at VPI told me that the Nordost wire on the Jmw9sig shouldn't be twisted... so the 2 options are either no anti skate, or using the mechanical piece. I've tried disabling it, and also tried several placements for the rubber washers on the mechanical piece. Things seem to be better with the piece in place, but either way I am getting the sibilance.

d) re-check your spindle to pivot measurement

I went ahead and printed off that hoffman protractor. The arc matches up perfectly with the arc on the MINT, which leads me to believe that overhang is good. Axel - I measured out 17mm from the spindle, and it looks like that is right where the stylus is falling ( : So, I don't know why it looks like the cartridge is too far out... but as far as I can measure, it looks right at 17mm overhang. Maybe the headshell on the VPI arm doesn't extend very far?

Setting overhang with the MINT

Setting zenith with the MINT

It looks to me like the zenith angle looks good... aligning to the cantilever of course.

Doug - thanks for your notes re: the phono stages. Currently I am using the PS audio stage which I hope would be able to handle things! Loading at 100ohms btw.

Still on my list is to try the VPI jig again (granted, I bought the MINT because I was getting sibilance with it at the start), and to also try another cartridge (I have a Benz L2 and a Shelter 901 in house). I'd like to make sure I've nailed setup with the Jubilee before I change carts though.

Anyway, I hope I am making at least a little bit of progress!

I can make another recording at any time, but as of now, I haven't made any changes to the setup.