CJ Well-known member GDIY Supporter Joined Jun 3, 2004 Messages 15,729 Location California Sep 20, 2014 #1 big and small, we love em all, transformers that is, twin coils for humbucking, used for the large capsule FET mic, Attachments u1.jpg 158.4 KB · Views: 118
big and small, we love em all, transformers that is, twin coils for humbucking, used for the large capsule FET mic,
CJ Well-known member GDIY Supporter Joined Jun 3, 2004 Messages 15,729 Location California Sep 20, 2014 #2 200 ohms out with series sec, Attachments u2.jpg 132.3 KB · Views: 83
CJ Well-known member GDIY Supporter Joined Jun 3, 2004 Messages 15,729 Location California Sep 20, 2014 #3 core bracket - just a micro drop of epoxy holding it on, hi perm lams need to breathe, (magneto-restrictive force) if you squeeze them tight they can not expand, this causes distortion, Attachments u3.jpg 167.5 KB · Views: 89
core bracket - just a micro drop of epoxy holding it on, hi perm lams need to breathe, (magneto-restrictive force) if you squeeze them tight they can not expand, this causes distortion,
CJ Well-known member GDIY Supporter Joined Jun 3, 2004 Messages 15,729 Location California Sep 20, 2014 #4 yes but what about the frequency? pretty dang flat for a 10:1, Attachments Nueman-U87-T13-Freq1.jpg 83.2 KB · Views: 125
CJ Well-known member GDIY Supporter Joined Jun 3, 2004 Messages 15,729 Location California Sep 20, 2014 #5 inductance vs frequency, low levels have to be used because a small Ni core saturates easily, Henris is Henries in German, ;D saturation below 10 Hz at 1 V-ac, but we can plot other curves, Attachments Neumann-U87-XFMR-HenriesFreq.jpg 74.8 KB · Views: 101
inductance vs frequency, low levels have to be used because a small Ni core saturates easily, Henris is Henries in German, ;D saturation below 10 Hz at 1 V-ac, but we can plot other curves,
CJ Well-known member GDIY Supporter Joined Jun 3, 2004 Messages 15,729 Location California Sep 20, 2014 #6 other curves, Attachments Neumann-U87-XFMR-HenriesLevel.jpg 86 KB · Views: 98
CJ Well-known member GDIY Supporter Joined Jun 3, 2004 Messages 15,729 Location California Sep 20, 2014 #7 can't take it apart, Ni perm will be ruined, so we send it back, came out of a nice mic, application> Attachments U87-schematic-1972.png 54.4 KB · Views: 149
can't take it apart, Ni perm will be ruined, so we send it back, came out of a nice mic, application>
MicDaddy Well-known member GDIY Supporter Joined Jul 11, 2010 Messages 887 Location Lincoln, Nebraska Sep 30, 2015 #8 Not much help but here's what little info I wrote down Attachments BV13.jpg 39.9 KB · Views: 182
