Broken stylus!

[Bonky]

Our cleaner has just left and I noticed that the Roksan Nima arm was halfway over the turntable and that the stylus on my AT33PTG/11 MC was broken. Trying to get hold of her...but can't at present. Perhaps a mishap with a duster?


Any suggestions for a compatible cartridge for the Nima?

I barely listen to LPs any more so would find it hard to justify an expensive replacement. Perhaps 'moving down' to a MM?

Eclectic music tastes (for a 76yr old!).

Thanks,

R

[Pigmy Pony]

Sorry to hear that Richard.

If you're happy to 'move down' to a MM cart, I have an Ortofon 2M Black you can have for free - the stylus is in good shape and has quite a few miles left on it, more than enough if you only use it occasionally.

Pm me if it's something you could use.

[Bonky]

Sorry to hear that Richard.

If you're happy to 'move down' to a MM cart, I have an Ortofon 2M Black you can have for free - the stylus is in good shape and has quite a few miles left on it, more than enough if you only use it occasionally.

Pm me if it's something you could use.

Thanks; PM sent.

R

[CageyH]

Sorry to hear that Richard.

If you're happy to 'move down' to a MM cart, I have an Ortofon 2M Black you can have for free - the stylus is in good shape and has quite a few miles left on it, more than enough if you only use it occasionally.

Pm me if it's something you could use.

Very kind of you.

[fordy]

House insurance usually covers this type of mishap

[Bonky]

Update: I'd like to publicly thank Steve (AKA Pigmy Pony) for his very kind offer of giving me an Ortofon 2M Black to replace my damaged AT 33PTG/2/MC. I had thought that the AT and the Roksan Nima arm were an extremely good match, but both my wife and I were very, very impressed with the sound of the 2M Black - and I think we prefer it. (Whether the AT was past its best -I don't know -perhaps!). I wonder if the arm (a unipivot) is better suited to MM rather than MC cartridges.

Has anyone any views?

Richard

[Pigmy Pony]

From what I've read it appears that the Ortofon MM carts are a popular choice for the Nima, and the 2MB at 7.2g is well inside the Nima's recommended range. You probably know this already.

Although, as we've discussed, the Black is known to be a bit of an arse to set up perfectly (certainly outside my skill set), the advantage with MM is that you can just swap out the stylus rather than needing a wholesale cartridge change. Ofc you'll know this already too!

Just my 2 pence worth

[AJSki2fly]

Update: I'd like to publicly thank Steve (AKA Pigmy Pony) for his very kind offer of giving me an Ortofon 2M Black to replace my damaged AT 33PTG/2/MC. I had thought that the AT and the Roksan Nima arm were an extremely good match, but both my wife and I were very, very impressed with the sound of the 2M Black - and I think we prefer it. (Whether the AT was past its best -I don't know -perhaps!). I wonder if the arm (a unipivot) is better suited to MM rather than MC cartridges.

Has anyone any views?

Richard

Hi Richard, this might explain it, I think I have it right, if you take the Effective Mass of your arm and the weight of the AT 33PTG II and its Compliance you will find the resonant frequency to be a bit low at 5.28hz , whereas for the Ortofon is good at just over 7hz. Also the 20 degree tracking angle for the Ortofon may be easier to achieve than the 23 for the AT. Calculator http://mh-audio.nl/Calculators/RF.html

As long as it sounds good that is what matters.

[Pigmy Pony]

Hi Richard, this might explain it, I think I have it right, if you take the Effective Mass of your arm and the weight of the AT 33PTG II and its Compliance you will find the resonant frequency to be a bit low at 5.28hz , whereas for the Ortofon is good at just over 7hz. Also the 20 degree tracking angle for the Ortofon may be easier to achieve than the 23 for the AT. Calculator http://mh-audio.nl/Calculators/RF.html

As long as it sounds good that is what matters.

There you go Richard, you are now on Adrian's radar, and that's a good thing Has a lot of experience with cartridge set up, and really knows his stuff.

[AJSki2fly]

There you go Richard, you are now on Adrian's radar, and that's a good thing Has a lot of experience with cartridge set up, and really knows his stuff.

Well I would not say that, just made a lot of ,mistakes along the way, talked to a few who know better and read a bit.

On another note Richard the AT 33PTG II spec has two Compliance figures a static compliance of :-

Static Compliance 40 x 10-6 cm/dyne
Dynamic Compliance 10 x 10-6 cm/dyne (100 Hz)

The dynamic compliance is the deflection of the cantilever under a sine wave signal of a given frequency (100hz), however from what I have read this can be misleading, and purely using static is not the best. a good explanation if anyone is interested is here https://nirvanasound.com/wp-content/...arm%20Mark.pdf

Using the Static Compliance gives the 5.28hz, the dynamic one gives as below so may be fine.

Eff. Tonearm Mass : 15.3 g
Cartridge Mass : 6.9g
Fastener Mass : 0.5g (a guesstimate)
Compliance : 10 x 10-6 cm/Dyne

Tonearm Resonant Frequency = 10.56 Hz

But and it is a big BUT, as the cartridge ages and depending on how much it is used the compliance figure will change. I suppose for some cartridges the suspension may harden and thus stiffen and become less compliant, and for others the suspending will weaken becoming more compliant, I think that is correct. If the cartridge is new, is not that old and not used that much then it is likely safe to rely on the manufacturers figure, if not then as the article mentions using a good test record with frequency sweep tests and measuring the output on a computer or scope is probably the only way to be sure.

This is meant to be good - https://www.analogueseduction.net/te...st-record.html I use this one https://www.analogueseduction.net/te...st-record.html