Matching stepup to phono stage

"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?

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.

Actually Bent Audio has a great page and chart explaining this.

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

Actually Bent Audio has a great page and chart explaining this.

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

Sorry, I didn't mean to talk down Bent Audio - John Chapman is a great guy who makes fantastic products. I just don't agree that it works to add resistors to step-ups to gain the desired load - from my experience with 8 or 9 different step-ups in various configurations with different carts and phonostages, it's always more desirable soundwise to get the load right by choosing the right step-up.

For a general discussion of loading, with formulae and online calculators, see Hagerman's page on the subject:

http://www.hagtech.com/loading.html

(Note: Hagerman also recommends varying the load with a resistor at the phonostage side - I've only done this once with a step-up, back when I had a Rogue 99, so I have less experience than with adding a resistor before the step-up. I'd still guess it's advantageous to simply choose the right step-up for your specific cartridge - keep it simple.)