Simplistic NJFET RIAA - Page 545

Salas · 21st December 2010, 04:34 PM

Merlin, have you got any sketch for df_genious by the way?

merlin el mago · 21st December 2010, 04:53 PM

Do you want a photo? balanced or unbalanced?

SGregory · 21st December 2010, 04:56 PM

df_genious,
Thats the fun of it. One strip board won't work for another due the the parts selected. It is a really simple circuit so it doesn't take long.

merlin el mago · 21st December 2010, 05:04 PM

Quote:

Originally Posted by SGregory

df_genious,
Thats the fun of it. One strip board won't work for another due the the parts selected. It is a really simple circuit so it doesn't take long.

df_genious, SGregoy has right, each one is specific for needed gain dependeing your cartridge & njfets stash that you have on hand thanks to Salas

vgeorge · 21st December 2010, 05:12 PM

Quote:

Originally Posted by Salas

Going well I see, but decouple those long incoming DC twisted pair wires right at the regs input connectors with some 0.1-1uF film cap each, also. I think its good practice. Or you are going to connect the M-Lytics for that?

I will connect the M-Lytics first and see if a film cap makes a difference later.
Ok, I connected everyting and initially both channels were working fine. But after a couple of minutes one channel the leds stoped working. Also DS voltage on Q1 stated to rise. Could you please help? Maybe problem with Q5?

Salas · 21st December 2010, 08:04 PM

90% its a Q5.

RCruz · 21st December 2010, 09:05 PM

Hi vgeorge

Would you please point us your schematic so we can follow this repair... what Q5 are you refering to ?

Salas · 22nd December 2010, 12:38 AM

He is referring to the LEDs feeding CCS JFET.

SGregory · 22nd December 2010, 02:40 AM

Upped the load resistor to 182R tonight. The presentation is getting back to right. Imaging is solid and tonality seems to be more balanced. Starting to notice some of the spookyness returning. Will try 220R in a day or so.

Starting to work on the v1.2R. Is the loop size as critical as the plain V1.2?

Salas · 22nd December 2010, 07:56 AM

Loop size its easier on the R. Not to make it wide like Red Square Moscow though.

21st December 2010, 04:56 PM	#5443
SGregory diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	df_genious, Thats the fun of it. One strip board won't work for another due the the parts selected. It is a really simple circuit so it doesn't take long. __________________ Living Life Doing the Waltz in 4/4 meter.

22nd December 2010, 02:40 AM	#5449
SGregory diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	Upped the load resistor to 182R tonight. The presentation is getting back to right. Imaging is solid and tonality seems to be more balanced. Starting to notice some of the spookyness returning. Will try 220R in a day or so. Starting to work on the v1.2R. Is the loop size as critical as the plain V1.2? __________________ Living Life Doing the Waltz in 4/4 meter.

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21st December 2010, 04:34 PM	#5441
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Merlin, have you got any sketch for df_genious by the way?

21st December 2010, 04:53 PM	#5442
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Do you want a photo? balanced or unbalanced?

21st December 2010, 08:04 PM	#5446
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	90% its a Q5.

21st December 2010, 09:05 PM	#5447
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	Hi vgeorge Would you please point us your schematic so we can follow this repair... what Q5 are you refering to ?

22nd December 2010, 12:38 AM	#5448
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	He is referring to the LEDs feeding CCS JFET.

22nd December 2010, 07:56 AM	#5450
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Loop size its easier on the R. Not to make it wide like Red Square Moscow though.