Simplistic NJFET RIAA

[RCruz]

Originally Posted by merlin el mago

Ricardo for R3 you suggested:

Left 45K473
Right 45K675

Salas for R3 suggested:

Left & Right 46K017

I don't know a lot of about electronics but I'm very curious, why are different values?

Salas sugestion was made before we knew about your true riaa values.

The three resistors R1 R3 and R5 interact so when you // 1M4 on the Left, you do not get only 45k473.... the riaa circuit "sees" 46k755.

If you input this value on the calculator http://www.kabusa.com/riaa.htm
you will get caps values that will sound acording to Lipshitz

For the right channel, my best bet would be // 1M9 so the final R would be 46k684.

Experiment with 2M as suggested by Salas, than finetune using lower values until you get the best results and let me know your findings.

After we set the correct values we can think about replacing with good resistors.

[RCruz]

This is an aproximation based on my listening experiences and following closely all of Salas sugestions.

IMO The calculator kabusa can only be correctly used if the input resistor value is calculated acording to this formulae: R equals (R1 + R3) paralleled with R5

R =1/((1/(R1 + R3)+(1/R5))

[massimo]

George cooks, Merlin cooks, Massimo cooks: should we open a Mediterranean Restaurant?
The very best from Greek, Spanish (OR Catalan if you prefer ) and Italian cusine!

[merlin el mago]

Originally Posted by massimo

George cooks, Merlin cooks, Massimo cooks: should we open a Mediterranean Restaurant?
The very best from Greek, Spanish (OR Catalan if you prefer ) and Italian cusine!

Well the real problem now is not the cook, is where open our famous Mediterranean Restaurant

[merlin el mago]

Originally Posted by massimo

George cooks, Merlin cooks, Massimo cooks: should we open a Mediterranean Restaurant?
The very best from Greek, Spanish (OR Catalan if you prefer ) and Italian cusine!

You forget Rcruz (cooks mathematics) & Salas(cooks electronics)

[merlin el mago]

Originally Posted by RCruz

This is an aproximation based on my listening experiences and following closely all of Salas sugestions.

IMO The calculator kabusa can only be correctly used if the input resistor value is calculated acording to this formulae: R equals (R1 + R3) paralleled with R5

R =1/((1/(R1 + R3)+(1/R5))

As per Salas design will be?

R = 3.300+47.000 // 1.000.000 = 47.891 R1 input Kabusa calculator
Kabusa R1 47.891 - R4 6.963 - C2 45nF664 - C3 15nF661
R4-C2-C3 are Salas schematic

So I suppose that in the design select closest standard values.

Mine real situation without changing nothing is?

Left
R = 3.300+47.000 // 1.130.000 = 48.156 input Kabusa R1
Kabusa R1 48.156 - R4 7.002 - C2 45nF412 - C3 15nF574


Right
R = 3.300+46.800 // 998.000 = 47.705
Kabusa R1 47.705 - R4 6.936 - C2 45nF842 - C3 15nF722

I am really enjoying.

[vgeorge]

Originally Posted by massimo

George cooks, Merlin cooks, Massimo cooks: should we open a Mediterranean Restaurant?
The very best from Greek, Spanish (OR Catalan if you prefer ) and Italian cusine!

Well, I already have a restaurant with greek food in my hotel!
If any of you comes here, I' m offering a free lunch or dinner.

[merlin el mago]

Originally Posted by vgeorge

Well, I already have a restaurant with greek food in my hotel!
If any of you comes here, I' m offering a free lunch or dinner.

Wow, you're living in Paradise.

[massimo]

Originally Posted by merlin el mago

Wow, you're living in Paradise.

Nearly..... in a Golden hotel, with a Golden restaurant over the Saronic Gulf

Ricardo can bring his Grandma's recipies for Bacahlau and Salas, the Master, will be our maître....

[RCruz]

Originally Posted by merlin el mago

As per Salas design will be?

R = 3.300+47.000 // 1.000.000 = 47.891 R1 input Kabusa calculator
Kabusa R1 47.891 - R4 6.963 - C2 45nF664 - C3 15nF661
R4-C2-C3 are Salas schematic

So I suppose that in the design select closest standard values.

Mine real situation without changing nothing is?

Left
R = 3.300+47.000 // 1.130.000 = 48.156 input Kabusa R1
Kabusa R1 48.156 - R4 7.002 - C2 45nF412 - C3 15nF574


Right
R = 3.300+46.800 // 998.000 = 47.705
Kabusa R1 47.705 - R4 6.936 - C2 45nF842 - C3 15nF722

I am really enjoying.

As you can see, with your actual setup R4 should be 7k
With your actual values the sound will be recessed.... You can either increase R4 or reduce R3 as I sugested before. (IMO The easier way)