Simplistic NJFET RIAA - Page 267

Salas · 11th November 2009, 02:14 AM

That will be best for noise with the Supex 909. 6.8R R2 for you, 100R load in, and don't forget to sink the 2SK170 that feeds the leds (Q6). And you will use V2R5 at 46V with it?

Tham · 11th November 2009, 02:28 AM

Still have not built V2R5 yet. I hope to have one built to replace the faulty v1.5 for my DAC for a start.

For the 4 2sk170 version, maybe I could try modifying my current p2p unit and increase the Vout of the v1.5 to 46V.

Salas · 11th November 2009, 02:31 AM

That will be a very interesting phono + shunt combination for your Supex. I wait to know your results and see pictures.

Tham · 11th November 2009, 02:45 AM

Hope to have it done soon

. May have a problem with 46v v1.5 though.

Salas · 11th November 2009, 03:14 AM

That V1 46V I have shown surely works if you have any problems. Has been made before. Only remember to get some TO92 minisinks for the 2SKs that feed the 46V Low MC leds ref, the one 550C in the shunt, or possibly 2n5087 if V1.5.

ikoflexer · 11th November 2009, 05:14 AM

Don't do v1.5; if you want simple and robust, do v1, otherwise v2r5c, which works better than v1.5 and it's better suited for higher voltages. Today I tested v2r5c with a brutal square wave load. Did well. It would be interesting if a good gyrator/cap multiplier would be a nice addition before the shunt, for a phono stage.

RCruz · 15th November 2009, 04:48 PM

Hi Salas

I am now using the 48db gain riaa with a clearaudio solution with a clearaudio talismann 0.5v output cart..... It is wonderfully sounding as is but maybe it could be better with a little more gain... should I try the 2200u cap on the first stage ?

nicoch58 · 15th November 2009, 04:57 PM

Quote:

Originally Posted by RCruz

clearaudio solution with a clearaudio talismann 0.5v output cart...

Salas · 15th November 2009, 05:33 PM

Quote:

Originally Posted by RCruz

Hi Salas

I am now using the 48db gain riaa with a clearaudio solution with a clearaudio talismann 0.5v output cart..... It is wonderfully sounding as is but maybe it could be better with a little more gain... should I try the 2200u cap on the first stage ?

Fastest solution, yes. Evaluate, it sounds good too.

RCruz · 15th November 2009, 05:38 PM

I am a little puzled after reading you are using a 56db riaa with the DL103 and needed the cap in the first stage... what is the DL103 output ?

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11th November 2009, 02:14 AM	#2661
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	That will be best for noise with the Supex 909. 6.8R R2 for you, 100R load in, and don't forget to sink the 2SK170 that feeds the leds (Q6). And you will use V2R5 at 46V with it?

11th November 2009, 02:28 AM	#2662
Tham diyAudio Member Join Date: Jun 2006	Still have not built V2R5 yet. I hope to have one built to replace the faulty v1.5 for my DAC for a start. For the 4 2sk170 version, maybe I could try modifying my current p2p unit and increase the Vout of the v1.5 to 46V.

11th November 2009, 02:31 AM	#2663
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	That will be a very interesting phono + shunt combination for your Supex. I wait to know your results and see pictures.

11th November 2009, 02:45 AM	#2664
Tham diyAudio Member Join Date: Jun 2006	Hope to have it done soon . May have a problem with 46v v1.5 though.

11th November 2009, 03:14 AM	#2665
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	That V1 46V I have shown surely works if you have any problems. Has been made before. Only remember to get some TO92 minisinks for the 2SKs that feed the 46V Low MC leds ref, the one 550C in the shunt, or possibly 2n5087 if V1.5.

11th November 2009, 05:14 AM	#2666
ikoflexer diyAudio Moderator Join Date: May 2008 Location: Toronto	Don't do v1.5; if you want simple and robust, do v1, otherwise v2r5c, which works better than v1.5 and it's better suited for higher voltages. Today I tested v2r5c with a brutal square wave load. Did well. It would be interesting if a good gyrator/cap multiplier would be a nice addition before the shunt, for a phono stage.

15th November 2009, 04:48 PM	#2667
RCruz diyAudio Member Join Date: Sep 2006 Location: Cascais Blog Entries: 1	Hi Salas I am now using the 48db gain riaa with a clearaudio solution with a clearaudio talismann 0.5v output cart..... It is wonderfully sounding as is but maybe it could be better with a little more gain... should I try the 2200u cap on the first stage ?

15th November 2009, 05:38 PM	#2670
RCruz diyAudio Member Join Date: Sep 2006 Location: Cascais Blog Entries: 1	I am a little puzled after reading you are using a 56db riaa with the DL103 and needed the cap in the first stage... what is the DL103 output ?

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