Simplistic NJFET RIAA - Page 53

kstlfido · 19th December 2008, 05:43 AM

Hi Salas-

Finally gathered parts for the shunt, using circuit from post #247.

Shunt resistors- would using 1W for all be OK? Looking at the pics, it seems R1 is larger...

Thanks- Kent

Salas · 19th December 2008, 06:21 AM

Hi,

1/4W will do even for R1. That resistor has only 0.7V across. So it dissipates 85mW only. Don't take those pics too seriously, normally I have some fatter ones because I do tubes and point to point. Its better to have fatter around practically. If there is some real point of interest or caution, I try to note it on the schematic. Use 1W for all resistors, no problem. You can handle them better for soldering.

P.S. How is your listening going up to now? Got rid of some little hum?

kstlfido · 19th December 2008, 06:39 AM

I left it on and the little 9v bat's died! I didn't want to say too much on how it sounds yet- parts still settling in and no shunt yet. Needless to say I have been enjoying listening!

Thx for heads up on the R's. Cool rainy night in Berkeley+solder iron in heated state+music playing= perfect night for tinkering!

Salas · 19th December 2008, 06:43 AM

Good! We will be waiting for your pictures and review after you have listened with the shunt.

Thomo · 19th December 2008, 08:09 AM

Hi guys. I haven't yet added the shunt reg, as it looks like my cartridge may be faulty! I've tried all manner of things in the TT setup, but I'm still getting sibilance.

I know it's a little o/t but does anyone have any experience of this cart?, I can't find much info on it.

Cheers, Lee.

nicoch58 · 19th December 2008, 08:39 AM

sibilance.... I know well .

AT are on detailed side ... to cure lower a bit the arm back

but is a system dipendend , I lost the last touch of sibilance with my new amp!!

Thomo · 19th December 2008, 08:49 AM

Thanks for the reply Nicoch. Detailed is good for me, as the rest of the system is a Pedja Rogic buffer, highly modded Quad 405, and modded Jamo concerts. Plenty good enough and balanced slightly on the warm side.

The sibilance is definitely from the TT side of things as there's not a trace of it from my modded cd94 cdp.

Regards, Lee.

nicoch58 · 19th December 2008, 08:58 AM

with seas magnesium cone ?

Lowering thr RL don't helps .... try to put some copper or soft material between AT and arm...naylon screw

nicoch58 · 19th December 2008, 09:05 AM

yes I look the avatar

don't helps,the best detailed cone ...sure dont' smooth the sibilance

nicoch58 · 19th December 2008, 09:12 AM

try a strategic series tantalun resistor ,smooth/clean the voice and gain a lot on ambient/reverb

I have inRload but have 10x effect on series volume

19th December 2008, 05:43 AM	#521
kstlfido diyAudio Member Join Date: Mar 2006 Location: Berkeley, CA	Shunt PS resistor wattage Hi Salas- Finally gathered parts for the shunt, using circuit from post #247. Shunt resistors- would using 1W for all be OK? Looking at the pics, it seems R1 is larger... Thanks- Kent

19th December 2008, 08:39 AM	#526
nicoch58 diyAudio Member Join Date: Oct 2004	sibilance.... I know well . AT are on detailed side ... to cure lower a bit the arm back but is a system dipendend , I lost the last touch of sibilance with my new amp!! __________________ Sic58

19th December 2008, 08:58 AM	#528
nicoch58 diyAudio Member Join Date: Oct 2004	with seas magnesium cone ? Lowering thr RL don't helps .... try to put some copper or soft material between AT and arm...naylon screw __________________ Sic58

19th December 2008, 09:05 AM	#529
nicoch58 diyAudio Member Join Date: Oct 2004	yes I look the avatar don't helps,the best detailed cone ...sure dont' smooth the sibilance __________________ Sic58

19th December 2008, 09:12 AM	#530
nicoch58 diyAudio Member Join Date: Oct 2004	try a strategic series tantalun resistor ,smooth/clean the voice and gain a lot on ambient/reverb I have inRload but have 10x effect on series volume __________________ Sic58


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19th December 2008, 06:21 AM	#522
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Hi, 1/4W will do even for R1. That resistor has only 0.7V across. So it dissipates 85mW only. Don't take those pics too seriously, normally I have some fatter ones because I do tubes and point to point. Its better to have fatter around practically. If there is some real point of interest or caution, I try to note it on the schematic. Use 1W for all resistors, no problem. You can handle them better for soldering. P.S. How is your listening going up to now? Got rid of some little hum?

19th December 2008, 06:39 AM	#523
kstlfido diyAudio Member Join Date: Mar 2006 Location: Berkeley, CA	I left it on and the little 9v bat's died! I didn't want to say too much on how it sounds yet- parts still settling in and no shunt yet. Needless to say I have been enjoying listening! Thx for heads up on the R's. Cool rainy night in Berkeley+solder iron in heated state+music playing= perfect night for tinkering!

19th December 2008, 06:43 AM	#524
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Good! We will be waiting for your pictures and review after you have listened with the shunt.

19th December 2008, 08:09 AM	#525
Thomo diyAudio Member Join Date: Nov 2006	Hi guys. I haven't yet added the shunt reg, as it looks like my cartridge may be faulty! I've tried all manner of things in the TT setup, but I'm still getting sibilance. I know it's a little o/t but does anyone have any experience of this cart?, I can't find much info on it. Cheers, Lee.

19th December 2008, 08:49 AM	#527
Thomo diyAudio Member Join Date: Nov 2006	Thanks for the reply Nicoch. Detailed is good for me, as the rest of the system is a Pedja Rogic buffer, highly modded Quad 405, and modded Jamo concerts. Plenty good enough and balanced slightly on the warm side. The sibilance is definitely from the TT side of things as there's not a trace of it from my modded cd94 cdp. Regards, Lee.

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