Simplistic NJFET RIAA

[RCruz]

I guess he means bypassing the gain resistor below the first stage

 

[maxpou]

Hi Guys,
i would like to know if you have a better sound with a bypass cap on RS in input stage? Thank you! Maxpou

 

[merlin el mago]

Hi Guys,
i would like to know if you have a better sound with a bypass cap on RS in input stage? Thank you! Maxpou

What phono are you using, same mine 63dBs, if yes following Salas advice I bypassed with a 10nF VISHAY-RODERSTEIN MKP-1837 Metalized Polypropylene Film Capacitor in parallel to C10 4.700uF HQ 10V, incredible perfomance in highs, now I'm other new member in the list "can't live without them"

 

[maxpou]

What phono are you using, same mine 63dBs, if yes following Salas advice I bypassed with a 10nF VISHAY-RODERSTEIN MKP-1837 Metalized Polypropylene Film Capacitor in parallel to C10 4.700uF HQ 10V, incredible perfomance in highs, now I'm other new member in the list "can't live without them"

Hi merlin,
I have the same phono of your but on my schematic I don't have 4700uF on RS and I would like to know if you have a big difference with and without 4700uF? Maxpou

 

[merlin el mago]

Hi Maxpou,

Due to the fact that I need gain never tried without the cap, but seems without cap it's only less gain for medium MC carts.

If do you want I try without cap & let you know?

 

[RCruz]

Please do Merlin !!!

I guess it should play better but with less gain.

 

[Joao@AltheaMusica]

I guess he means bypassing the gain resistor below the first stage

Ricardo

correct, Salas mentioned that more than 4 transistors in parallel will oscillate and my idea was bypassing the resistor - R2 - with a cap, i.e. 220uF.

Maybe it sounds better with less gain, but you can correct that in the second stage...

 

[merlin el mago]

Please do Merlin !!!

I guess it should play better but with less gain.

Hi RCruz,

I will do this week-end & let us know.

 

[merlin el mago]

OT

@massimo

Today the football match of the year: R. Madrid vs F.C. Barcelona. FORÇA BARÇA!!!!!

 

[RCruz]

Thank you merlin.

Why did you choose 10mA jfets for your build ?

 

[merlin el mago]

Because in the moment of building only had severals LSK389 & Salas choose these value tor (I suppose) get the gain asked for me.

Possible next Simplistic will be only with SK170 I have on hand a batch of 100 pieces matcheds but the gain will be 60dBs I have the schematic posted by Salas.

 

[massimo]

@massimo

Today the football match of the year: R. Madrid vs F.C. Barcelona. FORÇA BARÇA!!!!!

I was in Madrid last autumn and I watched on TV Barca Vs Real: "el clasico"!

Forza Real!

Tonite also Inter plays....

 

[massimo]

Possible next Simplistic will be only with SK170 I have on hand a batch of 100 pieces matcheds but the gain will be 60dBs I have the schematic posted by Salas.

Maybe in a hifi2000 cabinet with a single side big pcb with mirrored Shunt Reg v1.2 and RIAA + star ground..... If only I succeed to complete my layout

 

[maxpou]

Hi Guys,
PCB with suggestions of massimo. Maxpou

 

[merlin el mago]

Hi Guys,
PCB with suggestions of massimo. Maxpou

If you do it as per massimo 1st suggestion I assure that will works perfectly.

I'd like if you want to share your PCB, because will be nice for mine next project 60dBs Phono 2SK170BL, please send me a pm, thanks.

 

[merlin el mago]

I was in Madrid last autumn and I watched on TV Barca Vs Real: "el clasico"!

Forza Real!

Tonite also Inter plays....

So you saw our art-work Madrid 2 BARÇA 6

I'm sorry for you: Madrid 0 BARÇA 2

Do you know will be the next to taste our football.....

What's Inter does....Ohh only a tie vs Fiore

 

[merlin el mago]

Maybe in a hifi2000 cabinet with a single side big pcb with mirrored Shunt Reg v1.2 and RIAA + star ground..... If only I succeed to complete my layout

That's will be mine dream, wich gain will be?

 

[massimo]

Hi Guys,
PCB with suggestions of massimo. Maxpou

OK, next step "star power". I mean from V+ input, one track for each gain stage.....

 

[massimo]

That's will be mine dream, wich gain will be?

Dual JFet input, dual Rsource, no cap.... I guess 60 db or so.

 

[merlin el mago]

Dual JFet input, dual Rsource, no cap.... I guess 60 db or so.

Please, please don't follow more, every time I'm more interested, let me know asap, if you want to share the pcb tell me how much cost the pcb to share the cost buying fews.

Eto'o crack