RIAA NFB : I don't remember... Please remind me ! ;)

[tubelectron]

Hello Guys !

I am servicing and refining my ARC SP3A1 :

And I don't remember about the NFB RIAA correction what does what... 😕

I mean, among C5, R10, R7 C4 :

* Which R and C parts determine the BASS correction.

And :

* Which R and C parts determine the TREBLE correction.

Thanks for your reminder ! 😉

T

 

[MarcelvdG]

C5 and R10 define the 75 us time constant for the treble.

C4, R7 and the finite loop gain presumably set the 3.18 ms time constant for the bass (that is, as C₄R₇ > 3.18 ms, I guess the finite loop gain is involved).

C4, C5, R7 and R10 define the 318 us time constant for the bass.