Simplistic NJFET RIAA

[capritar]

Thanks so much. Very useful info on audio capacitors. It gets bewildering, i find. I may end up with my own cap collection, lol.

 

[maxpou]

2- 5.6-6.8uF
3- B+ to ground directly.

Thank you Salas very appreciated.

You can order them from HK through eBay. Search for Obbligato caps and Obbligato premium

Thank you too for info Massimo.

Maxpou

 

[merlin el mago]

@Salas

Still I have some noise, posible as you said before due to mine bad design in the RIAA connections between components, mine question is:

Have I any way or general rules to connect the components or to ground to avoid the noise, as per your kind advice I use coax shielded cable for signal & I grounded the gnds of the input RCAs by a 10nF to the chassis also grounded to gnd chassis the negative output of the regulator.

Thks in advance

 

[Salas]

You mean some hum left? After you used the second psu it stayed the same or added some? Now you have two points from regs neg to chassis. If it was better before, try to have one common point for both to chassis. Also close the box if its open. Did you do the remote by now?

 

[merlin el mago]

Yes, after 2nd psu stayed the same hum. About install one common point for both to chassis a do it before & the hum is more, better 2 points chassis for the neg. reg. Always the box is closed but without screws, no I don't have Rs.

 

[Salas]

So it is best with two points. Its a hands on thing to reduce. Sometimes a resistor like 10R can work between both or one point to chassis. Is something close to it that has Tx, mains cable near the inputs etc.

 

[merlin el mago]

So one 10R between neg reg & chassis, ok?

 

[Salas]

Yes, to one or both and listen. Experiments. Nobody can know the hum points beyond generalities if not there.

 

[merlin el mago]

Ok I will experiment with resistors an AC cable far from inputs I will let you know, thks.

 

[Salas]

What AC cable? We were talking -reg to chassis. Is AC running near too?

 

[maxpou]

Hi Merlin,
maybe this document help you with the interconnection ground and in this acticle has many good links. Maxpou

http://www.raleighaudio.com/Audio Component Grounding and Interconnection.pdf

 

[merlin el mago]

What AC cable? We were talking -reg to chassis. Is AC running near too?

Sorry (mea culpa) isn't AC cable it's DC cable from PS.

Connected 1st one 10R from neg reg to chassis & the hum is the same, 2ns connected the 2nd resistor 10R from the other neg reg to chassis & hum is the same.

N.B. when is some supposed electrostatic current in the vinyl & the cartridge is gathered to the support of the arm I bring over the vinyl without touching the cart & sound some clicks & pops, that's is the first time I hear, I never hear this wen used mine Cart Arkiv togheter mine phono Linto.

 

[Salas]

Read that article that Maxpou linked. Experiment.

Different cart now, different phono. Maybe when you will use your R-Core Txs things will change to the better for mains capacitive coupling from primary to secondary.

 

[merlin el mago]

Hi Merlin,
maybe this document help you with the interconnection ground and in this acticle has many good links. Maxpou

http://www.raleighaudio.com/Audio Component Grounding and Interconnection.pdf

Hi maxpou,
I read it, thks. Merlin.

 

[merlin el mago]

I'll try a star gnd in RIAA to see what happen.

 

[merlin el mago]

E U R E K A. Now NO HUM, only a little near maximum volume level, solution STAR GROUND in RIAA

 

[Salas]

You haven't tried that out before!!!! Good. Now resolution will go up a bit too. Next Rs. Far in the horizon...V1.2.

P.S. Can you show a picture for the people so they know various practical wirings for configurations?

 

[merlin el mago]

I'm sorry no photos, mine family is on holidays with mine camera so until on wednesday or on thursday next week can't post

I'm waiting the resistors to do the Rs, surely will arrive tomorrow.

 

[Salas]

OK one final post holiday picture with remote sensing too then.

 

[merlin el mago]

Ok I will try to do Rs & post the photo.