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Which SUT? .... for .3mv/10 ohms MC cartridge into 3mv MM input sensitivity

Please help me choose a SUT for my 1st MC cartridge.

Now I have more than enough volume using my existing MM cartridges thru my mx110z MM Phono input which says sensitivity 3mv/47k ohms impedance.

AT440ml is 3mv.
Shure 97xe is 4mv
Shure V15VxMR is 5mv
Grado ME+ Mono is 5mv.

coming tomorrow: AT33PTG/2 MC .3mv/10 ohm coil impedance/dc resistance

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

signal boost, am I getting it right?

1. Is 3mv a MINIMUM strength for the mx110z input?

2. .3mv x 10 = 3mv (+20db correct?) (minimum boost therefore x10/+20db)?

3, if correct, is .3 x 20 = 6mv equiv to +40db?

4. if so, a SUT providing +40db is more than enough for the .3mv and any likely future MC?
.........................

impedance/loading: I am not getting it.

I read about a general rule: coil impedance x 10 for ____?
A33PTG/2: 10 ohm coil x 10 = 100 ohm

too high impedance sounds thin? bright?
too low impedance sounds dull?

(how?) (minimum?) (where?)
......................................................

Thanks as always, and this time I will definitely wait for advice before getting anything. I am not in a hurry for this, Bill will loan me one of his SUT’s until I get my own.

Elliott


elliottbnewcombjr
elliottbnewcombjr OP
5,112 posts
 
Demagnetizer, who loses sleep over this?

Miyajima Labs sometimes include demagnitizing built in

"When several months pass, a stepup transformer and the cartridge are magnetized.
The demagnetizer short-circuits ... "

If true, couldn’t I use my demagnetizing wand for my reel to reel decks for this?
jperry
2,430 posts
 
You may want to do some reading here. I think it will help answer many of your questions, and answers to your questions, about cartridges and SUT. Lots of great info on all things hi fi.

https://www.audioasylum.com/cgi/d.mpl?audio/faq.html
vortrex
273 posts
 
Air Tight SUTs have bypass for MM. 

Post removed 
elliottbnewcombjr OP
5,112 posts
 
I went thru all the notes, every recommendation, every one I found. I couldn't put myself or you thru any more research. I got mail to open, bills to pay today deadline!  

I chose the Fidelity Research FRT-4 because:

3 inputs, bypass and 4 settings: 3 ohms,10 ohms, 30 ohms,100 ohms

For this cartridge .3mv/10ohm:

10 ohm = 21x = 6.3mV = 107 ohm load
30 ohm = 18x = 5.5mv = 140 ohm load

3 ohm and 100 ohm options for unknown future MC

MM pass thru for my Mono Cartridge

I like 3 inputs option too, you never know.

Unit tested, seller knows electronics, 100% rating, takes returns

https://www.ebay.com/itm/333648114135?ul_noapp=true 

So, 'add to cart'. $630. + ship + tax + fees
..................................

It's all Bill's fault I fell into this MC rabbit hole.

Thanks to everyone, it was a treat to go back and review the whole thread. This forum has been good to me.

Elliott





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