RIAA filter not accurate

[Hans Polak]

Just for completeness to see the difference:
Now without the 200nF input cap and with the original 110pF and 330pF caps instead of 105pF and 320pF in posting #17, frequency response with the same 300mH / 600Ohm virtual cartridge and 60pF cable capacity, looks like:



Hans

 

[triode_al]

This implies or serves to show that the EAR834 outcome depends on the cartridge.
Point taken.
But then - if the EAR834 is driven by a SUT/step up transformer or is fed from a prepre (for instance Hiraga’s simple 2SK170 set-up)?
Does your whole excercise imply that connecting such an input invalidates the whole respnse ?
I am worried as I am in. The midst of such a build. 😱
Albert

 

[Hans Polak]

This implies or serves to show that the EAR834 outcome depends on the cartridge.
Point taken.
But then - if the EAR834 is driven by a SUT/step up transformer or is fed from a prepre (for instance Hiraga’s simple 2SK170 set-up)?
Does your whole excercise imply that connecting such an input invalidates the whole respnse ?
I am worried as I am in. The midst of such a build. 😱
Albert

Hi Albert,


Don't worry too much.
The difference between the (300mH + 600 Ohm) Cart in Blue and a straight wire in Green simulating a low output impedance prepre is neglectable in the audio band, see image below.
However using MM carts with different induction values can make a difference from 10Khz and higher.


Hans

 

[triode_al]

Thanks Hans,
I plan to innovate a little bit in the connection of the MC cartridge to the EAR834. Will follow this up separately.
Albert