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Matching stepup to phono stage

If I use a moving coil stepup transformer (Quicksilver) before my phono stage (CJ Premier 15) do I keep the the CJ Premier 15 loading at 47K or do I change the CJ loading to the recommended loading of the catridge. The input impedance of the Stepup is 250 ohms.

Thanks,
Rich
rhbblb1
soundwatts
221 posts
 
Patrick

Why are you not recommending Bent Audio.
rhbblb1 OP
10 posts
 
"The impedance presented to your cartridge will be the combination of the 250 ohms of the step-up and the 47Kohms of your phono stage."

OK, but how do they interact. How can the "final" impedance be calculated?
clio09
3,355 posts
 
Rhbblb1 - if you send me an email offline I will send you a spreadsheet that I used that will do the calculations based on different step-up ratios in combination with the resistor values of the step-up and phono stage.

As an example. I used a K&K Audio step-up with a Hagerman Trumpet. The step-up had a 10:1 ratio. Using 47k ohm resistors in the step-up in parallel with the Trumpets 47k ohms yielded 940 ohms.
soundwatts
221 posts
 
Actually Bent Audio has a great page and chart explaining this.

http://bentaudio.com/parts/tx103loadhow.html
soundwatts
221 posts
 
Actually Bent Audio has a great page and chart explaining this.

http://bentaudio.com/parts/tx103loadhow.html
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