Quick Question RE: Transimpedance/CI

[Jackl3y]

Maybe I’m wrong but I thought that a transimpedance phonostage needed more gain for higher resistance carts. Like a 1 ohm cart needs less than a 20ohm.

if this is correct then why would a company make 2 flavors of a given phone stage; one that’s 0 to 5 ohms and one that’s 5-40ohms?

I’m sorry if this is a dumb question, as many threads discuss it I’ve never seen it imperically stated.

 

[Solypsa]

... why would a company make 2 flavors of a given phone stage; one that’s 0 to 5 ohms and one that’s 5-40ohms?

'Why' seems easy - to work with a greater variety of cartridges!

'How' now that is a question

What preamp(s) are you referring to?

 

[Jackl3y]

'Why' seems easy - to work with a greater variety of cartridges!

'How' now that is a question

What preamp(s) are you referring to?

The 47 Labs Arare

Untitled Document

 

[Solypsa]

From their site :

"Most of MC cartridges available in the current market are compatible with the standard version. For those cartridges with an extremely small output level and/or high internal impedance, we have the high-gain version. The standard version has 75dB and the high-gain version has 90dB of gain. Since it is a current amplification device with 0 ohm input impedance, output level is determined by the output amperage of the cartridge (output voltage divided by internal impedance). If you are not sure about which version suites better for your cartridge, please contact SAKURA SYSTEMS"

Gain needs are hence variable, more as impedance goes up. But many carts also increase in output as impedance goes up ( not all tho, good example Benz carts with non ferrous core ).

So you need to decide what gain you need, based on a particular cart and the gain structure of the rest of your components.

 

[Jackl3y]

From their site :

"Most of MC cartridges available in the current market are compatible with the standard version. For those cartridges with an extremely small output level and/or high internal impedance, we have the high-gain version. The standard version has 75dB and the high-gain version has 90dB of gain. Since it is a current amplification device with 0 ohm input impedance, output level is determined by the output amperage of the cartridge (output voltage divided by internal impedance). If you are not sure about which version suites better for your cartridge, please contact SAKURA SYSTEMS"

Gain needs are hence variable, more as impedance goes up. But many carts also increase in output as impedance goes up ( not all tho, good example Benz carts with non ferrous core ).

So you need to decide what gain you need, based on a particular cart and the gain structure of the rest of your components.

I must have totally missed that part about the gain. Drats!
Thanks again. I appreciate your very helpful replies.