Ortofon MC A90 Cartridge VTF

Dear Jtinn: In the other side there is no reason to "
wait "/hope that the cartridge performs the same in
three different TT/tonearms ( I'm assuming were different
but two tonearms. Btw, same IC tonearms/phono stage cables?
), the
cartridge/tonearm/TT relationship is " personal "
especially cartridge/tonearm and along that
cartridge/tonearm then the load impedance and even than the
SRA belongs to each recording the same cartridge in
different tonearm sometimes needs different VTA/SRA to tame
the sound.

I comment this because only one cartridge was on the
manufacturer VTF recomendation, is obvious by your posts
that you don't try this cartridge in the tonearm where the
cartridge performs like you like at 1.56grs. and niether the
other way around too.

Normaly a cartridge of this caliber and coming from Ortofon
IMHO have to perform in excellent/top manner inside the
manufacturer specs/advise if the cartridge makes good match
with the tonearm and if the cartridge is full and in good
operation conditions.

Anyway, Ortofon has the best/precise answer on that 1.56grs
VTF.

Regards and enjoy the music,
Raul.

I've commented regularly for 3+ years about exactly the same VTF behavior with two ZYX UNIverses. I'd be astonished if an A90 or any other cartridge acted differently. Individual details and numbers vary, but not the basic behavior.

All cartridges have elastomeric suspensions. All elastomers alter with usage, age and climatic conditions (some more than others). Therefore, the amount of downforce needed for optimal performance changes.

To clarify a point made by Tbg, excessive VTF sounds nothing like inaccurate SRA. The two effects are utterly different, at least in our system and to our ears. Yes, changing VTF does alter VTA and SRA, particularly with modern styli, but that doesn't undo the fact that the VTF sweet spot of a cartridge changes. It just means you have to monitor both parameters to maintain optimum performance.

both A90's, one on the Rockport with VTF at 2.06 grams with 65 hours on it, and the other one on the Garrard/Reed 2P with VTF at 1.56 grams with 120 hours on it, are still sounding stellar 10 days later.

Steve Dobbins took the 3rd A90 (which had been on the Kodo 'The Beat'/Reed 2P at 1.91 grams with 40+ hours on it) back home with him when he left.

this past week i had 2 visitors that really enjoyed both tt/arm/cart combos. one in particular who is well known for his knowledge of idler tt performance, commented on how the Garrard's performance had surpassed what he thought possible from that type of design.

in a few weeks i'll try different (heavier) VTF's to see if those current settings are still ideal.

Mike, I still wonder what your quest is. Is it the lightest tracking force or the sound? I assume that you are redoing the VTA with each lower tracking weight. Is that the case? Also, are you readjusting the overhang in each case? Do you have a mistracking record? I am asking this as I will soon be able to use my Ortofon and have only very old experience in setting up anything other than the Shindo Labs cartridge on their tt. With it you have no overhang adjustment and the tracking weight is a very firm stated 2.85 grams. Even VTA is strongly recommended. Everything is intended solely for the Shindo set up.

I have found that the VTA is very critical on the Shindo and would be surprised were it not on the Ortofon.

Norm,

my quest is only what sounds most real....in all seriousness. i don't have any pre-concieved notion on VTF. it either sounds best or it does not. i do think that only over time and open-minded listening and experimentation can the most ideal VTF/VTA be found.....and even then as the cartridge suspension softens over time these points can change.

i would say that with a new cartridge like the A90, initial break-in should be done in the recommended range, in this case 2.0--2.5 grams. with this particular A90 after about 25 hours on it i did do some experimantation and found 2.20 grams to be the best. but now there is 120 hours on that same cartridge.

we (Steve Dobbins, Jonathan Tinn and myself) had listened for awhile with the Garrard/Reed/A90 (with 120 hours on it) at 2.20 grams VTF. Jonathan felt that overall it was a bit sluggish and lacking 'sparkle' on top and suggested that we try to get it better. Steve was doing the adjustments and all three of us were listening. first Steve lowered VTF, it was better. then lowered it again, better. this cycle was repeated three or so more times. finally it got a bit thin on top, so we went back to the previous spot. better. then went lighter, worse. so back to that spot. now we worked on VTA. we went higher in back...worse. back to the same spot. better. then lower. worse. so back to the same spot. better. then we listened to some different cuts. it sounded great; amazing detail, body, open on top, powerful, articulate bass. then we measured. 1.56 grams. we were all taken aback.

regarding the Shindo and VTA. IMHO tt's don't have VTA, arms and cartridges have VTA. not that Shindo might not recognize that VTA can be very critical, but a particular cart and arm won't have different VTA on different tt's. other forces would account for different VTA's....degree of cartridge breakin, actual VTF, quality of set-up, degree of anti-skate. ambient conditions...etc. etc.

as far as overhang, VTF and VTA; they are somewhat interactive; howvever i am skeptical that overhang would change enough after 40+ hours on a cartridge (of suspension softening) to bother with messing with. it would be nanometers. and VTF will change VTA and SRA more than actually raising and lowering the arm a milimeter. the Reed 2P arm has a lever which allows for a 10mm range of 'on-the-fly' dynamic VTA adjustment which is great to hear tiny VTA adjustments....which we used.