MM cartridges

In order to rest my Grace Ruby, I have been doing a lot of listening lately to my Acutex LPM320STRIII, the long nose version (on a Dynavector DV505 with DV headshell). It gets better and better with frequent use, and I daresay that at this point I would judge it to be "different" from the Ruby, but not necessarily inferior. I also own an M320 and plan to audition it soon to find out whether Raul was really correct in saying it outperforms the LPM series. Harold, have you compared the M320 to an LPM320 in your own system? All of this may be moot to the OP, since Acutex's seem to be rare birds these days. Grace Ruby is another gem, of course. Vintage Grados, e.g., the TLZ and XTZ are excellent too, with low-ish output compared to an average MM. I wonder if we could bring Raul back to life by starting a new thread of this kind; he may have a patent on this sort of discussion.

I guess what the OP is learning is not to use the Decca on his particular tonearm.

I´m using the Trans-Fi air bearing linear tracker. I have not experienced the newer, long nose edition of the ACUTEX 320 but have the LPM315. Compared to the M320 it is not as certain and pure on the most demanding material, it just can´t make the highest transient attacks and therefore can´t reach the highest dynamics. I´d say its trackability is slightly limited. Otherwise it´s an excellent performer though.
Vic at Trans-Fi Audio found the M320 as the very best MM after having auditioned several top MM´s like the Garrott, Decca´s top dog, and the AT-150MLX. Don´t get me wrong, the Decca collected too much dust in his system, that´s the reason he gave up. Anyway, now he´s using namely the ANV150. Don´t take my word, visit his site.

A word about loading capacitance. All vintage top AT´s recommend low capacitance values 100 - 200 pF and I think the ANV150´s is just the same. IME very low capacitance gives better sound quality, and AT recommends these low values. In fact, my preamp´s inherent capacitance is 30 pF and Trans-Fi tracker´s wiring has 25 - 30 pF. So I´m running my AT-ML180/OCC at 60 pF and it sounds better than ever.

Someone in Mexico please call Raul
we have a new thread

Dover and Dougdeacon, what is it about the Audiomods arm that makes it unsuitable for use with Decca/London cartridges? The common wisdom has always been that they like damped unipivots, but London importer Warren Gregoire tells me they actually require a stiff arm tube and good bearings, both of which the Audiomods arm possesses. As to effective mass, the compliance of the cartridges is 10X10-6cm/dyne vertical and 15X10-6cm/dyne lateral, which requires an arm of medium mass to get the arm/cartridge resonance around 10Hz. The Audiomods can be had with a counterweight of several different masses, one of which will enable that figure to be reached. Are there other considerations than those I've mentioned?

Bdp24,
I would agree with the Decca importer - stiff arm tube and good bearings. I have set up about 20 Deccas in various arms.The most common back in the day here was the Linn Ittok. Results were variable.The best results I got from a Decca were with a Zeta tonearm, stiff arm tube and good bearings. I had an Audiomods arm on my Verdier briefly - it is excellent value for money - but I would not put a lower compliance cartridge in it. It is a bit like putting formula 1 or Indycar tyres on a Toyota Prius. Yes the tyres are better but the handling will be worse. At worst I have seen damaged records from mistracking Decca's ( remember there is no cantilever ) where the arm has not been good enough.
Arm cartridge matching is a bit of a lost art today, because with internet purchasing dealers cannot afford to carry a variety of arms & cartridges. Specifications do not always tell the story. Because nothings perfect even the best arms and cartridges are a panoply of resonances - thus results vary considerably with different combinations. The Decca is at the low end of the compliance and due to the lack of a conventional cantilever does impart a lot of energy that has to be managed by the arm. I would only recommend it with a top arm.
Probably the best analogy I can give you is the Rega RB300 back in the 80's when it was launched. A lot of folk on a budget put Koetsu Black cartridges on the Rega RB300 because the arm was "good enough", that is, it did not mistrack and they like the Koetsu sound. However it was easy to demonstrate that if you replaced that with a much better arm ( e.g. Zeta/Alphason/SME ) and a good quality medium compliance MM ( e.g. Grace F9E ) then the overall result was more relaxed, more musically coherent and ultimately more enjoyable.
Another example of the TT/Arm/Cartridge hierarchy - I initially set up the Verdier with the Audiomods and a Goldring MM. In the same system I had running an SME20/SME V/Lyra Skala SL. The Verdier combo absolutely left the SME combo for dead despite the disparity in cartridges.