2-stage split gain phono preamp with passive-active RIAA

[stratokaster83]

Thanks Marcel, I will look into Hans' research.

 

[andyr]

Assuming total capacitance of 100pF or less, resistive loads between 68kOhm and 100kOhm seem to give the best frequency response and the least amount of peaking compared to conventional loading (47kOhm + 150-300pF), at least for my cartridges.

I presume you arrived at this conclusion by actually listening to the carts, with loadings between 68k and 100k?

Or do you think computer modelling is preferable?

 

[Hearinspace]

I never heard of PhonoLCR, but if it models . . . . . .

It's on this page.

 

[MarcelvdG]

Thanks. It models the loaded cartridge with just two ideal resistors, an ideal inductance, an ideal capacitance and a voltage source, like I was afraid it would do. No mechanical effects and no iron losses included.

 

[arjen6t8]

From the various threads on this forum I have learned that you need a test record if you want to be able to say anything useful about your cartridge loading. If you don't have or don't want to go that route, you can see if you can find your cartridge on this page, albeit they only test with 47 k loading and varying capacitance. This is how I settled on my loading for my build with an Ortofon 2M Red cart.

 

[stratokaster83]

I have a couple of test records, I’ll have to check if they contain any frequency sweeps.