CJ

JBL Model 5901 Universal Mic Input XFMR
« on: November 22, 2009, 05:55:53 PM »
really a nice piece of iron, it was a joy unwinding 8060 turns of #45, but hey, i'm jus sayin,





the jaws of Death...



« Last Edit: November 22, 2009, 06:11:36 PM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


CJ

Re: JBL Model 5901 Universal Mic Input XFMR
« Reply #1 on: November 23, 2009, 01:26:55 AM »


off with the head>





this thing is built, check the drive pins, what a pain,



       

i swear this stuff smells like plumbers putty,























Lams:  24-25 EL - 80 Ni with Insulaze coating, .014 thick, square stack, 1 x 1 , 

Pri: 403 T #36 green wire,  L - 6.6 Henries  D: 1.43 DCR-31 Ohms   Start Pin 8 - Finish Pin 5

Cu Foil E Shield between pri and sec, soldered brn wire,

Sec: 8060 T #45 green wire, L-  2,400 Henries (est) D: .62 DCR - 2.8 K Ohms S - Pin 1 F -Pin  9

Turns Ratio - 1 : 20

Impedance Ratio; 1: 400

Input Impedance: 50 Ohms

Output Impedance: 20 K Ohms

« Last Edit: November 23, 2009, 02:16:17 AM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: JBL Model 5901 Universal Mic Input XFMR New
« Reply #2 on: December 10, 2018, 01:03:07 AM »
finally the print>

« Last Edit: December 10, 2018, 05:25:20 PM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

radardoug

Re: JBL Model 5901 Universal Mic Input XFMR
« Reply #3 on: December 10, 2018, 02:51:19 AM »
Hey CJ, isn't that an octal plug, so no pin 9? What pin number is the shield?

CJ

Re: JBL Model 5901 Universal Mic Input XFMR New
« Reply #4 on: December 10, 2018, 04:41:00 PM »
it is a 9 pin octal, weird,

shield is pin 4 and is now marked,

cj
« Last Edit: December 10, 2018, 05:24:22 PM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


 

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