Post questions or comments about the J99 here.
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- Op Amp Questions
by Todzilla » Mon Sep 28, 2020 7:15 am
- 1 Replies
- 6053 Views
- Last post by codeman015
Thu Oct 29, 2020 12:03 pm
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- A question about trim pot values
by DreamBig » Wed Jan 30, 2019 10:59 am
- 0 Replies
- 4269 Views
- Last post by DreamBig
Wed Jan 30, 2019 10:59 am
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- Lessons Learned: Failure and Success
by heddykevy » Tue Feb 16, 2016 8:02 am
- 0 Replies
- 1986 Views
- Last post by heddykevy
Tue Feb 16, 2016 8:02 am
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- Servo problem with J99s
by SoundBase » Thu Dec 17, 2015 9:28 am
- 1 Replies
- 1598 Views
- Last post by SoundBase
Mon Dec 21, 2015 10:05 am
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- Tim, any reason I can't use 918 Op-Amps in the J99
by Category 5 » Thu Jun 26, 2014 8:57 am
- 0 Replies
- 2280 Views
- Last post by Category 5
Thu Jun 26, 2014 8:57 am
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- 990C's suppose to get hot?
by 4johnny » Tue Jun 24, 2014 5:53 am
- 0 Replies
- 2205 Views
- Last post by 4johnny
Tue Jun 24, 2014 5:53 am
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- different response when phase is flipped
by teleharmonic » Tue Sep 05, 2006 7:39 pm
- 10 Replies
- 5198 Views
- Last post by Fattyma4
Tue May 13, 2014 9:22 pm
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- R40 Smoking
by NuSkoolTone » Wed Mar 18, 2009 3:08 pm
- 11 Replies
- 5271 Views
- Last post by Meyer
Mon Dec 02, 2013 2:29 am
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- Modding AD797 J99 with 990s
by fredpg » Tue Jul 23, 2013 11:31 am
- 0 Replies
- 2013 Views
- Last post by fredpg
Tue Jul 23, 2013 11:31 am
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- 1st three steps of gain very loud
by Monty70 » Wed Jun 19, 2013 5:46 pm
- 2 Replies
- 2178 Views
- Last post by Monty70
Sun Jun 23, 2013 1:50 pm
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- Op-Amp availability
by Soundman1402 » Fri Feb 22, 2013 3:11 pm
- 0 Replies
- 2213 Views
- Last post by Soundman1402
Fri Feb 22, 2013 3:11 pm
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- J99 and phantom power
by Mylithra » Mon Feb 27, 2012 2:35 pm
- 2 Replies
- 2297 Views
- Last post by Mylithra
Thu Nov 29, 2012 9:47 pm
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- U2 (SC99) Voltage is really high @ bias config step
by geistnote » Fri Jul 13, 2012 10:35 pm
- 2 Replies
- 2080 Views
- Last post by tpryan
Sun Jul 15, 2012 2:53 pm
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- J99b
by amaysn » Sat Mar 10, 2012 8:34 am
- 2 Replies
- 2760 Views
- Last post by amaysn
Sun Mar 18, 2012 4:41 am
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- SCA J99 Experience
by mws » Sat Mar 19, 2011 6:25 pm
- 2 Replies
- 3480 Views
- Last post by Karl
Fri Feb 24, 2012 10:28 pm
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- V 3.3 Board, Assembly Instructions?
by Phrazemaster » Mon Jan 23, 2012 12:47 am
- 2 Replies
- 2235 Views
- Last post by elaine
Wed Feb 08, 2012 2:10 am
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- Just got my first J99 Up and Running and...Wow!!
by Phrazemaster » Sat Jan 28, 2012 6:50 pm
- 0 Replies
- 2341 Views
- Last post by Phrazemaster
Sat Jan 28, 2012 6:50 pm
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- power-up test with or without op-amps?
by dbonin » Sat Dec 24, 2011 9:24 am
- 1 Replies
- 2107 Views
- Last post by dbonin
Sun Dec 25, 2011 11:41 am
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- Houston, we have a problem! discharges/drop-out audio
by serpaven » Wed Nov 02, 2011 7:47 am
- 11 Replies
- 4238 Views
- Last post by serpaven
Sun Dec 18, 2011 5:14 am
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- j99 U1/U2 voltages off
by jpsthecelt » Tue Oct 11, 2011 4:13 pm
- 1 Replies
- 2078 Views
- Last post by jpsthecelt
Tue Oct 11, 2011 5:06 pm
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- Oscillation issue when gain is at, or above 2-3 o clock
by crtstudios » Fri Sep 23, 2011 3:48 pm
- 1 Replies
- 2062 Views
- Last post by tpryan
Sun Sep 25, 2011 10:24 am
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- Frying bacon
by Sean S » Wed Jun 22, 2011 8:33 am
- 3 Replies
- 2588 Views
- Last post by Sean S
Sat Aug 20, 2011 5:26 am
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- correct voltages, no sound
by malcolm » Thu Jul 28, 2011 11:46 am
- 2 Replies
- 2260 Views
- Last post by Randyman...
Fri Aug 12, 2011 5:40 pm
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- All tests perfect - no audio (SOLVED)
by jamesnorth » Mon May 09, 2011 2:56 am
- 12 Replies
- 4998 Views
- Last post by tpryan
Mon Jun 13, 2011 11:02 am
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- J99 noise high gain
by Thepilgrimsdream » Sun May 15, 2011 5:37 pm
- 6 Replies
- 3625 Views
- Last post by tpryan
Mon Jun 13, 2011 10:58 am
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- Bad SC99?
by mikeyg » Thu Apr 28, 2011 7:59 pm
- 3 Replies
- 2607 Views
- Last post by tpryan
Mon May 02, 2011 6:03 pm
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- There is unknown noise at +48V situation
by mojave3 » Sun Feb 13, 2011 4:07 am
- 6 Replies
- 3182 Views
- Last post by tpryan
Tue Apr 26, 2011 11:21 am
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- noise while using gain switch
by mikikiki » Wed Mar 30, 2011 2:33 pm
- 1 Replies
- 2233 Views
- Last post by tpryan
Sun Apr 03, 2011 2:57 pm
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- wrong voltage at U3 with J99
by mikikiki » Sun Mar 27, 2011 5:41 pm
- 3 Replies
- 2476 Views
- Last post by tpryan
Sun Apr 03, 2011 2:53 pm
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- Biasing issue
by MLAudio » Tue Mar 15, 2011 9:10 am
- 5 Replies
- 3163 Views
- Last post by MLAudio
Fri Mar 18, 2011 3:45 pm
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- J6 and J7 jumpers, and other thoughts!
by dtrax » Fri Mar 04, 2011 11:21 pm
- 2 Replies
- 2398 Views
- Last post by dtrax
Mon Mar 14, 2011 9:05 pm
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- J99 - mismatched levels
by P_N » Thu Feb 24, 2011 7:27 am
- 4 Replies
- 2966 Views
- Last post by tpryan
Sun Feb 27, 2011 8:00 am
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- The Short on CONN 1
by MRath » Thu Jan 20, 2011 7:51 am
- 1 Replies
- 2413 Views
- Last post by tpryan
Fri Jan 21, 2011 3:37 pm
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- Jumper Settings J1 & J2
by mrosso » Thu Feb 23, 2006 6:46 pm
- 10 Replies
- 6808 Views
- Last post by tpryan
Tue Nov 30, 2010 1:43 pm
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- turn off/disable the phantom power, jumper 3
by Brian Ellingboe » Fri Nov 26, 2010 3:39 pm
- 1 Replies
- 2284 Views
- Last post by tpryan
Fri Nov 26, 2010 4:40 pm
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- j8 resistance question
by marchuk » Fri Nov 12, 2010 2:38 pm
- 1 Replies
- 2354 Views
- Last post by tpryan
Tue Nov 16, 2010 2:37 pm
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- J99 Rev 2.0
by MLAudio » Sun Sep 12, 2010 8:35 am
- 1 Replies
- 2356 Views
- Last post by tpryan
Fri Sep 17, 2010 8:49 am
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- U3
by room4studios » Wed Jun 23, 2010 11:04 am
- 3 Replies
- 2680 Views
- Last post by tpryan
Fri Jun 25, 2010 4:56 pm
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- C18 & C22 Wrong Voltage?
by room4studios » Sat Jun 19, 2010 6:12 am
- 2 Replies
- 2395 Views
- Last post by tpryan
Sat Jun 19, 2010 10:51 am
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- Forsell's JFET-992 Op-Amps anyone?
by niccolo » Sun Jul 26, 2009 4:33 am
- 10 Replies
- 7026 Views
- Last post by Soundman1402
Thu May 27, 2010 4:29 pm
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- trouble with biasing rev 3.6
by packagebear » Tue May 25, 2010 5:15 pm
- 2 Replies
- 2574 Views
- Last post by packagebear
Thu May 27, 2010 1:32 pm
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- Trouble with another 990C?
by Archmart » Sun Mar 14, 2010 5:47 pm
- 16 Replies
- 7234 Views
- Last post by Archmart
Sun Apr 18, 2010 3:04 pm
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- Different versions?
by edwin » Tue Dec 16, 2008 5:14 pm
- 7 Replies
- 4621 Views
- Last post by Archmart
Sun Mar 07, 2010 4:56 pm
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- Switchable impedence possible?
by Thunder Audio » Tue Aug 16, 2005 1:47 pm
- 3 Replies
- 3899 Views
- Last post by tpryan
Fri Mar 05, 2010 1:08 pm
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- Problems on both J99s
by atiller » Tue Sep 22, 2009 8:16 pm
- 13 Replies
- 7390 Views
- Last post by atiller
Sun Feb 21, 2010 5:26 pm
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- blinking led on power supply with j99 connected
by jashwa » Thu Oct 15, 2009 4:22 pm
- 0 Replies
- 2721 Views
- Last post by jashwa
Thu Oct 15, 2009 4:22 pm
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- AD797 vs. 990c
by jwschaff » Tue Sep 05, 2006 8:55 am
- 5 Replies
- 6289 Views
- Last post by mmarton
Sun Jul 26, 2009 1:28 pm
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- I can't adjust the bias correctly
by elbartolo » Fri Jun 05, 2009 12:34 am
- 9 Replies
- 5340 Views
- Last post by elbartolo
Fri Jun 26, 2009 8:56 am
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- SW2 stop pins: must be non conductive? *SOLVED*
by niccolo » Wed Jun 17, 2009 1:27 pm
- 3 Replies
- 2935 Views
- Last post by niccolo
Sat Jun 20, 2009 5:19 pm
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- J99's clipping before my AD (MH2882) *SOLVED*
by niccolo » Fri Feb 08, 2008 5:41 pm
- 3 Replies
- 3102 Views
- Last post by niccolo
Wed Apr 08, 2009 9:57 am
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