I want to wind my own SUTs. I know what ratio I want. I know my cartridges impedance and desired loading. What I can not find is how do you calculate the number of turns for either the primary or the secondary? From what I have read I THINK you find out the permability of the core you are using then calculate the inductance you want based on that. And from the inductance you can get the number of turns. Is this right?
Also I can not find out what my target inductance wants to be. Can someone PLEASE help me out here?
I need a 1:2 ratio. My cart puts out 2.7mv the gain of my phono amp is not high enough to use that so I want to get it to 5mv.
The impedance of my cart is 150Ω
Desired loading is 1000Ω
I want an 80% nickel core.
So what is either my primary or secondary turns number?
Jeff
Also I can not find out what my target inductance wants to be. Can someone PLEASE help me out here?
I need a 1:2 ratio. My cart puts out 2.7mv the gain of my phono amp is not high enough to use that so I want to get it to 5mv.
The impedance of my cart is 150Ω
Desired loading is 1000Ω
I want an 80% nickel core.
So what is either my primary or secondary turns number?
Jeff
Although the answers to your specific questions will not be answered, I'd read this a couple times... it's the single best page of information on the internet regarding SUT.
http://www.rothwellaudioproducts.co.uk/html/mc_step-up_transformers_explai.html
Also, I've never heard of a cartridge transformer with a 1:2 ratio, that's a paltry 3db and the gain can be better made somewhere else in the audio chain.
http://www.rothwellaudioproducts.co.uk/html/mc_step-up_transformers_explai.html
Also, I've never heard of a cartridge transformer with a 1:2 ratio, that's a paltry 3db and the gain can be better made somewhere else in the audio chain.
Rothwellaudioproducts. makes an SUT for MC HO carts. It is 3:1. They do exist. And I do not want to change my amp. I have attached the schematic for my phono amp. If you can tell me how to get more gain out of this I am listening. I would be ok with a resistor or cap change if that would do it.
The second stage would have to redesigned to use a 12AX7. That would give you enough extra gain,
but the output impedance of the phono stage would be larger.
but the output impedance of the phono stage would be larger.
I hope the HOMC transformer is 1:3.. that would work better.
Do you have any opamps and perfboard laying around? If you cribbed up a little test circuit with 3db gain you would understand just how little it is. Remember that for something to sound “twice as loud” you need a gain of about 10db.
What is your cartridge?
Also are you running out of knob turn on your preamp? Or is it just not as loud as you want at a general knob position that you’re used to?
Have you used any SUT in your system? How did that work?
Do you have any opamps and perfboard laying around? If you cribbed up a little test circuit with 3db gain you would understand just how little it is. Remember that for something to sound “twice as loud” you need a gain of about 10db.
What is your cartridge?
Also are you running out of knob turn on your preamp? Or is it just not as loud as you want at a general knob position that you’re used to?
Have you used any SUT in your system? How did that work?