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Cartridge, Compliance, try what in my JVC UA-7082 Arm?

So, what to try in my new JVC UA-7082 Tonearm when it comes? (effective length 282mm) (11-1/8")

Guidelines? Advice? (I never bothered learning about compliance, I guess now's the time).

Anyone know the Mass of the UA-7082 Tonearm without a cartridge _______?
.....................................

Self Imposed Restrictions:

High Output, 4.0mV or more (to avoid tube preamp hum zone until it's repaired).

MM Only. (I am fundamentally opposed to MC pre-pre amp, as well as needing high output).


.......................................

Motley Crew On Hand:

4 headshells, none special

Shure MicroRidge Stylus and V15VxMR Cartridge

Shure V15VMR Cartridge (no stylus, I gave it a dirty look and it broke, horribly brittle shaft)

Shure 97xe Elliptical Stylus and Cartridge (despite it's low pedigree it's my current favorite).

Shure N78S Stylus (fits 97xe) (I did not inherit the 78's someone threatened me with).

Shure M44E Stylus and Cartridge

Audio Technica MicroLine AT440ML OOC Stylus and Cartridge

Audio Technica AT7000 body, no stylus

Audio Technica ATP-2

Audio Technica Series VIII P mount 

Audio Technica ___? Came with the AT120 TT (tracks 2.5g, I never used it) 

................................
It's a busy time, it doesn't get here till mid Jan, so theirs time to research.

Thanks in advance, Elliott






elliottbnewcombjr
mijostyn's avatar
mijostyn
8,570 posts
 
Hi Elliot, You are making life difficult. The Japanese mostly design their arms around stiff moving coil cartridges. My guess is the arm has an effective mass somewhere between 15 and 20 grams which is too heavy for many moving magnet cartridges like the Ortofon 2M series. The Sound Smith Zephyr MK III is a low compliance high output cartridge that would work well in your arm. Down the line is the Irox Blue. These cartridges have a compliance of 10 u/mN which is perfect for your arm. You want something between 10 and 15 u/mN. The Clearaudio MM's are 15 u/mN.  Another important factor is the weight of the cartridge. Here is a graph that compares total effective mass (tonearm and cartridge) to compliance.
https://www.ortofon.com/support/support-hifi/resonance-frequency/
Just add the weight of the cartridge to the effective mass of the arm for the total effective mass and look where it falls on the graph. I try to shoot for a resonance frequency between 8 and 10 Hz. I think the bass is better
if you can get it down there. 

Mike

uberwaltz's avatar
uberwaltz
13,381 posts
 
From memory and I may be wrong right now I think the OP requires a fairly high output cartridge due to some issue with his phono stage.
I think he said around 4mv which is very high and would likely only be served by some vintage mm carts and possibly some Soundsmith carts.

Elliott can you clarify on this and just what is the phono stage problem if this is so.
Thx
uberwaltz's avatar
uberwaltz
13,381 posts
 
The preamp has hum that starts just above my max listening volume, so I need to get a mono cartridge with high enough output, Shure 97xe gives 4.0mV now. so I wouldn't go below 4.0mV for the new Mono cartridge.

I'm gonna take the preamp to McIntosh in the spring when I visit my photo friend who lives 15 minutes from their headquarters in Binghamton, NY.
Guess my memory not so shabby.
I know this is referring to a mono cartridge but it has to be the same phono stage?
Or not possibly.
Is this still the situation Elliott?
If so it is probably really going to dampen your new table performance.
Spring is a long way off......
elliottbnewcombjr OP
5,521 posts
 
Well,

I have tricky ways to avoid pushing the preamp volume up to hum zone. With current 4.0mV output, the hum starts just above my preferred maximum, that is why I am looking for high output, equal to 4.0mV.

alt. use 1. Current. 

TT  to McIntosh tube tuner/preamp mx110z (thru preamp for it's wonderful Phono EQ), Then preamp to Cayin A88T tube amp, via Cayin's 'preamp in", (just a thruput). Volume is from McIntosh preamp.  Volume limited by hum.

alt use 2.

TT to preamp for it's Phono EQ. Importantly, it has 2 MM phono inputs. I will use 1 for 12" stereo arm, other for 9" mono arm.

Then, the difference, plug the preamp into any Cayin amp line in, get volume from Cayin amp, no nooise of any kind.

alt use 3.

Now possible, using current TT (won't be option for TT81/7082/7045).

This would work until I have the preamp overhauled.

Audio-Technica has built-in phono preamp. I use it, go straight to Tube Amp, skip going thru McIntosh preamp.

In spring get preamp overhauled by McIntosh, solving hum.

................................

As I say, with 97xe 4.0mV, the hum starts just above. If I get lower output, then we get into hum territory.


elliottbnewcombjr OP
5,521 posts
 
So, we find a stiff Mono cartridge IF I buy a Victor 7045 arm,

or, I get a different arm designed for/will work with high output MM Mono cartridge.
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