Post questions or comments about the J99 here.
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- J99 not functioning on gain steps 11 and 12
by andywho » Thu Feb 05, 2009 5:45 pm
- 3 Replies
- 3728 Views
- Last post by andywho
Thu Feb 12, 2009 10:20 pm
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- Strange Noises
by bighud » Mon Jul 14, 2008 8:17 am
- 3 Replies
- 3328 Views
- Last post by bighud
Thu Jan 22, 2009 11:06 am
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- Phase switch sounds like low pass filter
by gdanielson » Mon Jan 12, 2009 9:38 pm
- 7 Replies
- 4508 Views
- Last post by gdanielson
Mon Jan 19, 2009 11:01 pm
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- J99 high pitched sound
by Jeff » Wed Dec 24, 2008 1:07 pm
- 6 Replies
- 4197 Views
- Last post by tpryan
Fri Jan 09, 2009 5:28 pm
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- Need help with my new J99s - SOLVED
by quintosardo » Fri Sep 19, 2008 11:59 am
- 1 Replies
- 2524 Views
- Last post by quintosardo
Fri Sep 19, 2008 1:18 pm
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- Another HF Hum Thread
by Albert » Tue Aug 12, 2008 12:57 pm
- 6 Replies
- 4357 Views
- Last post by tpryan
Thu Sep 04, 2008 9:05 am
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- J99 Input Transformer question
by davidmen » Wed Aug 13, 2008 10:33 pm
- 1 Replies
- 2486 Views
- Last post by tpryan
Fri Aug 15, 2008 7:51 am
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- HF-Noise on my J99
by manfi » Tue Jan 23, 2007 6:06 am
- 7 Replies
- 5209 Views
- Last post by manfi
Wed Aug 13, 2008 6:13 am
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- Two J99's Output different on both
by Nu-tra » Sun Jul 20, 2008 10:17 pm
- 10 Replies
- 5641 Views
- Last post by Nu-tra
Mon Aug 11, 2008 1:07 pm
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- op amp for j99 order 2?
by sands » Mon Jul 28, 2008 4:53 pm
- 4 Replies
- 3416 Views
- Last post by sands
Sun Aug 03, 2008 6:35 pm
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- SC99 vs. JH 990c
by oshearer » Tue Jul 15, 2008 7:13 pm
- 0 Replies
- 2847 Views
- Last post by oshearer
Tue Jul 15, 2008 7:13 pm
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- Clarification on Rev 3.6 J99 and Sticky Note
by jciolek » Mon Jun 09, 2008 11:42 am
- 1 Replies
- 2265 Views
- Last post by tpryan
Fri Jun 13, 2008 6:57 am
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- intermittent white noise
by andywho » Tue Mar 11, 2008 7:03 pm
- 1 Replies
- 2239 Views
- Last post by andywho
Mon Jun 09, 2008 9:38 pm
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- Can i just use the AD797's?
by packagebear » Sun Jun 08, 2008 7:32 pm
- 0 Replies
- 2198 Views
- Last post by packagebear
Sun Jun 08, 2008 7:32 pm
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- Dull/muddy output on J99 with 990c's
by codeman015 » Wed Mar 19, 2008 2:56 pm
- 3 Replies
- 3152 Views
- Last post by tpryan
Tue Apr 08, 2008 11:12 am
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- Rev. 3.3 assembly instructions - Found the info !
by oddur » Thu Mar 13, 2008 9:09 am
- 2 Replies
- 2521 Views
- Last post by oddur
Fri Mar 14, 2008 7:28 am
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- Hardy 990 Options
by d_cham » Sun Feb 24, 2008 7:25 pm
- 1 Replies
- 2635 Views
- Last post by d_cham
Sun Feb 24, 2008 7:51 pm
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- 797 overheating (solved--two bad 797s, just my luck)
by paavo » Sat Feb 16, 2008 3:42 pm
- 31 Replies
- 48778 Views
- Last post by paavo
Wed Feb 20, 2008 2:34 pm
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- C2 / C11 orientation in Rev. 3.5?
by paavo » Mon Feb 18, 2008 11:21 am
- 1 Replies
- 1806 Views
- Last post by paavo
Mon Feb 18, 2008 11:27 am
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- Hum - FIXED (I hope)
by tazman » Thu Jan 24, 2008 8:21 am
- 5 Replies
- 3458 Views
- Last post by tazman
Sat Jan 26, 2008 5:45 am
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- J99 power leads
by zandurian » Wed Jan 23, 2008 4:30 pm
- 0 Replies
- 2040 Views
- Last post by zandurian
Wed Jan 23, 2008 4:30 pm
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- trouble adjusting J99's
by dandeurloo » Sat Oct 14, 2006 7:49 pm
- 35 Replies
- 61145 Views
- Last post by tpryan
Mon Jan 21, 2008 10:57 pm
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- Jumpers, again..
by niccolo » Sun Jan 13, 2008 7:45 am
- 2 Replies
- 2417 Views
- Last post by niccolo
Tue Jan 15, 2008 2:41 am
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- J99 Input bias current adjustment.
by mondstein » Mon Dec 31, 2007 9:43 am
- 3 Replies
- 2730 Views
- Last post by tpryan
Sun Jan 06, 2008 9:18 am
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- J99's make whole rack buzz
by tazman » Thu Dec 27, 2007 11:56 am
- 4 Replies
- 3128 Views
- Last post by tpryan
Thu Dec 27, 2007 3:39 pm
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- Wrong resistors?
by tazman » Sat Dec 22, 2007 7:46 am
- 2 Replies
- 2339 Views
- Last post by tpryan
Sun Dec 23, 2007 8:26 am
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- U3 voltages
by tazman » Sat Dec 22, 2007 2:57 pm
- 1 Replies
- 1895 Views
- Last post by tpryan
Sun Dec 23, 2007 8:25 am
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- Getting ready to build my J99's, any suggestions?
by tazman » Thu Dec 20, 2007 4:49 am
- 5 Replies
- 3276 Views
- Last post by niccolo
Thu Dec 20, 2007 1:09 pm
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- OpAmps question
by tazman » Thu Dec 13, 2007 10:24 am
- 1 Replies
- 2229 Views
- Last post by tpryan
Thu Dec 13, 2007 3:04 pm
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- J99 vs. T15?
by d7aug9 » Tue Nov 06, 2007 9:59 pm
- 2 Replies
- 3011 Views
- Last post by tazman
Mon Dec 03, 2007 2:13 pm
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- Step 38 and beyond
by craigmorris74 » Wed Oct 31, 2007 3:18 pm
- 4 Replies
- 3350 Views
- Last post by craigmorris74
Thu Nov 01, 2007 6:39 pm
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- J99 gain is very hot
by cwalcott » Mon Aug 20, 2007 12:41 pm
- 3 Replies
- 3046 Views
- Last post by cwalcott
Sun Oct 14, 2007 10:53 am
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- j99 / 797 u9 biasing
by mattrobertson » Wed Sep 12, 2007 2:47 am
- 10 Replies
- 5205 Views
- Last post by mattrobertson
Thu Oct 04, 2007 2:17 pm
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- Did I smoke my 99oC?
by Bmushal » Mon Sep 03, 2007 2:28 pm
- 2 Replies
- 2477 Views
- Last post by Bmushal
Wed Sep 05, 2007 7:44 am
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- 990c get pretty hot
by chingon » Mon Sep 03, 2007 9:59 am
- 1 Replies
- 2370 Views
- Last post by tpryan
Tue Sep 04, 2007 11:50 am
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- ad797 super hot at U9
by aphid310 » Sat Aug 11, 2007 2:20 pm
- 13 Replies
- 7217 Views
- Last post by tpryan
Tue Aug 21, 2007 5:45 pm
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- J99-resistor-tan with one black stripe
by deadbeatpope » Fri Jul 20, 2007 9:35 am
- 3 Replies
- 3190 Views
- Last post by tpryan
Wed Jul 25, 2007 4:56 pm
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- Trouble at Step 38 and on...
by Archmart » Sun Jul 08, 2007 6:50 pm
- 18 Replies
- 32037 Views
- Last post by Archmart
Sun Jul 15, 2007 11:51 am
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- J3 and J4
by cwalcott » Sat Jun 23, 2007 3:45 pm
- 3 Replies
- 2812 Views
- Last post by cwalcott
Tue Jun 26, 2007 5:39 am
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- AD797 vs. 990C shootout
by CoteRotie » Wed Jun 20, 2007 9:45 pm
- 2 Replies
- 3204 Views
- Last post by CoteRotie
Sun Jun 24, 2007 12:57 pm
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- ELECTRO-KINETIX OA-829B Op-Amp?
by rmiller2101 » Thu Jun 07, 2007 4:12 am
- 0 Replies
- 6215 Views
- Last post by rmiller2101
Thu Jun 07, 2007 4:12 am
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- John Hardy 990C for sale
by chingon » Tue May 22, 2007 10:08 am
- 0 Replies
- 6499 Views
- Last post by chingon
Tue May 22, 2007 10:08 am
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- Verify the Sticky Please
by chemical32winter » Wed May 16, 2007 4:30 pm
- 2 Replies
- 2443 Views
- Last post by chemical32winter
Thu May 17, 2007 12:16 pm
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- 6k65 black resistors instead of color coded?
by stickers » Tue May 15, 2007 10:19 am
- 1 Replies
- 2042 Views
- Last post by tpryan
Tue May 15, 2007 11:01 am
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- Voltages for the AD797 opamp?
by hopelessennui » Thu Mar 22, 2007 1:05 pm
- 5 Replies
- 3380 Views
- Last post by Bij
Thu Apr 26, 2007 1:57 am
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- Voltages for 990 op amp in J99 Module
by dwire » Tue Apr 17, 2007 7:51 am
- 0 Replies
- 6221 Views
- Last post by dwire
Tue Apr 17, 2007 7:51 am
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- Can I use a pair of sc25's in my j99?
by jlearman » Thu Mar 22, 2007 12:01 pm
- 1 Replies
- 2345 Views
- Last post by tpryan
Fri Mar 30, 2007 4:04 pm
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- DIY 990 op amp? Has anyone used it?
by jlearman » Thu Mar 22, 2007 8:08 pm
- 3 Replies
- 3030 Views
- Last post by chingon
Sat Mar 24, 2007 11:44 am
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- voltage
by chingon » Sat Mar 17, 2007 6:48 pm
- 3 Replies
- 2860 Views
- Last post by chingon
Tue Mar 20, 2007 12:08 pm
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- Blazing hot U4!
by hopelessennui » Mon Mar 19, 2007 10:36 pm
- 1 Replies
- 2011 Views
- Last post by hopelessennui
Mon Mar 19, 2007 10:52 pm
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