Simplistic NJFET RIAA

Yes, depends on the final sound you are after, in the total system concept. I prefer the Silmic there, but the FC is more neutral. Use FC for all local decouplers. If you have followed Ricardo (RCruz) you may have seen that he tuned it as a whole for his total system sound. The good thing is that Ricardo showed us that the circuit has the resolution and listens to tuning. What output capacitors you have in mind?
 
Nothing for know. I want to keep the wholeness that I think characterize your designs but dynamics is also very important to me.
Having these two covered everything is covered because you then listen to music. Everything else could be a subject for hi end people to chat.

The largest value I have at hand for that position is a couple of Mundorf tin foil (2u2) so I gess I want your recomendation on that too.
 
Auricap. But start listening with what you have. To see where it initially stands after burn in. Maybe a VTA change can cover you, you can't know from now. Nothing is carved in stone. We can project to some changes after first taste in YOUR system. RCruz will have much to say too.
 
IMO C3 is fundamental for the overall equilibrium. (I settled with
15700pF soviet with 320p mica)

C1 must be a high Q cap to enable as much bandwith as possible... (FT-3 teflon)

For the output I am using 4.7u obbligato AL film caps... quite good for the price.

Be very carefull choosing Rload. and fine tune with VTA.

Ricardo
 
I must correct the previous statement due to the different component names in my schematic.

When I refered to C1, I meant C4 (100nF) in your case.

This riaa + shunt combination is a very high definition combination and responds very well to component change... It enables you to hear the differences between the components.

Led string is very important, reducing noise and increasing detail retrieval.... please report the effect of using a FC as bypass. (I have a BG STD there)

Regards

Ricardo

Note: For 47n C2 I found that a obbligato alu film sounds tighter than a PIO.
 
Salas said:

Incorporating the shunts on the phono board and using them per stage is the optimum practice. Use one for the first stages and one for the other two. First stage is the one you want to isolate the most.

Hi Salas

When I upgraded from 1 to 2 shunts, I noticed an increase in channel separation with corresponding sound stage widening and a noticeably lower compression.

I use one shunt per stage but acording to your comment should I review the setup ?

Ricardo
 
RCruz said:


Hi Salas

When I upgraded from 1 to 2 shunts, I noticed an increase in channel separation with corresponding sound stage widening and a noticeably lower compression.

I use one shunt per stage but acording to your comment should I review the setup ?

Ricardo

Marinos is thinking of a step further. 4 on board shunts. 2 for L-R first stage, 2 for L-R second stage + buffer.
 
Salas said:
Nice work. What are you going to power?

thank's Salas, it's for my line pre-amp and maybe later for front end of my power amp.


AndrewT said:
Hi,
Q5 needs to be a low Vds device. Keep the sk170 here.
Q6 & Q7 do not need low Vds devices in these locations. Save your expensive and soon to be obsolete 2sk170 for where they are needed.
Replace Q6 & Q7 with cheap and easy to obtain jFETs.

Replace all the 2sk74 with Nchannel devices.


Salas said:
*If there is need to economize on Toshiba devices.

Has been done with 2Nxxxx devices except Q5 when there was a shortage. Link. Worked OK. Neg schema. Drains towards earth.

thank you for advise i will modified my board. Maxpou
 
Last report on the output caps bypass.... I believe I will keep the FT-3 100nF on the obligato 4.7uF.

The combination is very good indeed bringing loads of hidden detail and extending the low end as well.

Also it seems to remove any edginess from female voice and Miles Horn. (Outstanding).

Ricardo :violin: :violin: :violin: