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Phono Preamp Gain

Hi all,

I am in the process of getting a new cartridge and I want to make sure the output voltage is a good fit for my system. First off here's what I'm working with:

VPI Prime
Schiit Mani (30dB, 42dB, 48dB, 59dB gain options)
Prima Luna Dialogue Premium Integrated (239mV input sensitivity using KT88 tubes) (S/N ratio 81)
JBL L100

My question is what do I use for Vout in this equation to calculate the correct gain to choose on the Schiit Mani phono preamp??


20log(Vout/Vin)


Using the input sensitivity of the integrated and the output voltage of the  Soundsmith Otello ES Moving Iron Cartridge I get 

20log(.239V/.00212V) = 41dB gain

Is this correct?
My main issue is I dont know if my assumption to use .239V is correct.

Cheers



nmo25

Showing 2 responses by tablejockey

tablejockey
4,032 posts
 
nmo25,

I HAVE the PL HP, a VPI,and used a Schiit Mani, while my main unit was in the shop.

Don't drive yourself mad figuring what is "absolute" on paper.

One of the 2 first MM settings will be fine. Using your ears, in this instance, won't damage anything. 

The Mani is a great entry level, cheap unit. In my case, it served as something to get by with, while waiting for my "proper" phonostage to be repaired.

Your system is being underserved. With that amp,table/cart and speaker setup, you're  only hearing 60-70% of what it's capable of.

Consider a  Chinook or Herron, they seem to be the 2 most popular tube based units here. Use a tube phonostage to keep the tube vibe(realistic/convincing) presentation. You have that PL(tubed) for a reason.

Naturally, this is IMHO.
tablejockey
4,032 posts
 
"I’m not sure if the JBLs are anywhat of a good match for the Primaluna but I got them for dirt cheap at an estate sale so they are staying for a while."

nmo25- I bet the JBL's will sound good, if you like the "vintage sound"

Vintage sound to me is not overly detailed, overall presentation leaning on the warm side. There shouldn't be any lack of bass with the JBL's.

You might be able to fine tune the JBL's tone with the 2 gain tubes on the PL.


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