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Grace F14 MONO cartridges and styli

Dear all, i have to start this thread because i’ve come across first MONO cartride in my system.

The cartridge is extremely rare Grace F14 (MONO) LC-OFC from the mid 80’s.
I’m a huge fan of the Grace stereo cartridges, in stereo world the F14 LC-OFC is superb, this MM generator is the best ever made along with LEVEL II LC-OFC. As you might know the Grace made so many different styli with different cantilevers and different diamonds for F14 and LEVEL II series in the 80’s.

BUT I know nothing about mono cartridges, because i’ve never used any of them.
And i don’t even have enough MONO records, but i got some for sure.

I don’t play 78rpm SP ... and most of my mono records are 45 rpm (7’inchers) from the 60’s, 70’s, maybe a little bit from the 50’s.

My F14 LC-OFC cartridge has ONLY 2 PINS (not 4 pins like stereo versions). The special lead wire designed for use with mono is included, no problem with that.

Looking at the MONO stylus on my F14 MONO cartridge i realized it is not an SP version described here (definitely not a huge 3 mil. tip), but a nude stylus tip, small just like stereo tip on some other Grace styli that i have in collection. So it’s a good news, because i’m not gonna play 78 rpm anyway.

What i realized by trying this cartridge/stylus on my mono records is a lower compliance of the stylus compared to normal Grace (they are high compliance). The stylus replacement designed for F14 (not for older F9), the plastic shape of the F14 is always different compared to F9.

I’ve searched for MONO styli shapes online and i’ve seen many articles about oldschool conical styli of the different size for the mono records from the different eras. Also about the mono cut on stereo cutterhead.

I could find only one more Grace mono cartridge (LEVEL II) with 1 mil. conical tip described here. 

BUT this post on another forum is the most interesting:

"I play a number of vintage monos (primarily stuff from ’58 to the mid 60’s, admittedly no pre ’57 stuff) here with a modern microridge stylus and would never go back to using a conical on them (having done so in the past). They sound incredibly good with the microridge...

Based on my experience, I feel all the talk of conical styli being necessary to get the best out of mono records is urban legend at best, if not patently false."

If this is true i can use any stylus on my Grace MONO cartridge for my records pressed in the 60s/70s in mono ?

I don’t have a mono switch anywhere on my gear, but since the cartridge pins are designed for MONO only, i believe, i’m safe to cancel vertical noise caused by conventional stylus with vertical compliance ?

I can not detect a stylus shape yet, it can be Conical, Elliptical, Shibata (or maybe even Micro Ridge). I’ve heard they are all good for MONO made with stereo cutter head in the 60’, 70’s or even today.

Let me know what you think, it can be my first mono cartridge then.
128x128chakster
chakster's avatar
chakster OP
6,144 posts
 
@hdm thanks for the link

I think i will copy paste J.Carr's comment here:

Even if the LP groove is mono, you will get maximum information retrieval if the vertical stylus contact is maximized and the longitudinal stylus contact is minimized. This dictates a line-contact stylus - similar to the requirements for a stereo LP.

But there are two things to watch out for regarding the stylus shape.

One is that many earlier mono LPs have shallow bottoms, and/or the bottoms of the groove are mired in decades of accumulated grime. You can run into problems with tracking and noise if the stylus shape is narrow and pointed enough to allow the very tip to touch the bottom of the groove or the dirt that may be there.

Two is that a line-contact stylus will make the effects of stylus rake angle (SRA) and cantilever rake angle (which I think is a far more descriptive term for cartridges than VTA) more noticeable, and if you have a tonearm that doesn't allow easy height control, you may be better off with a spherical stylus.

Regarding coil structure, it should be real mono rather than strapped stereo. On paper, strapped stereo coils, or using a mono switch on the preamp will get the job done. In the real world the results are audibly better with real mono coils. Canceling whatever vertical noise component that may be present in a mono groove assumes very tight matching of channel output as well as magnetic and capacitive crosstalk - but this assumption doesn't hold up well in the real world. And in general (with amplifiers as well as transducers), not picking up an error component in the first place is preferable to picking it up and trying to cancel it out later.

Regarding vertical compliance, a mono cartridge should have it. Mono LPs are not tougher than stereo LPs, both are made from the same materials, and both will remain in good condition for a lot longer if grooves are not subjected to high pressure - especially if that pressure is concentrated on a narrow area of the groove. If the cartridge suspension has no vertical compliance, the same stylus will require higher tracking forces than if there is vertical compliance.

This also becomes an argument in favor of line-contact styli, since they do the best job of distributing the vertical tracking forces over a wide area of the groove. ... 

hope that this has been informative, jonathan carr

sleepwalker65's avatar
sleepwalker65
832 posts
 
Why do manufacturers bridge the two channels of a mono version of a stereo cartridge? Wouldn’t it be more sonically accurate to take the signal from only the horizontal coil?
lewm
12,461 posts
 
I’m not sure that’s a good question.
It seems that Lyra orients one coil of a stereo cartridge such that it doesn’t react to vertical displacement. But it’s there.
hdm
1,055 posts
 
Somebody can correct me if I am wrong but my understanding is that stereo cartridges will typically be 2 coils at a 45 degree orientation to allow pickup of both vertical and horizontal signal. 

Mono cartridges will either be a single coil mounted horizontally (think Denon 102, Chakster's Grace, both with 2 pins only) or two separate horizontal mono coils to work a bit more gracefully in a stereo set up (think the various Lyra, AT 33 Mono etc. with the typical 4 pin configuration).

Manufacturers bridge the stereo version because it's cost effective, not because it offers the best performance, which it won't. For that, they'd have to totally build another cartridge with the coil(s) in the horizontal orientation. 
sleepwalker65's avatar
sleepwalker65
832 posts
 
But in a MM cartridge the body is 5% of the cost. Seems to me they could just wire both channels to the horizontal and call it a day. 
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