CJ

Wire used in FM Detector Transformer?
« on: April 16, 2020, 06:54:18 AM »
Does anybody know what kind of wire they use in RF coils that has a silver color rather than your standard red enameled copper wire?

You see it on RF coils in the front end also. A few turns o copper wire then a few turns of silver wire.


We are rewind a Marantz IF board  ratio detector.

Here is a p ic showing the gray wire up top,  it does stick to a magnet.

Thanks for for any help!
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


moamps

Re: Wire used in FM Detector Transformer?
« Reply #1 on: April 16, 2020, 03:20:00 PM »
It is most probably silver plated copper wire (you know, skin effect and so). Be careful, this wire isn't usually coated, so adjacent windings should be moved apart.

CJ

Re: Wire used in FM Detector Transformer?
« Reply #2 on: April 16, 2020, 04:06:37 PM »
I thought it might be silver plated copper also, but the wire is magnetic and was also very springy when compared to the copper wire we took of. Thinking it might be nichrome.

It does have an insulation over it as you have to scrape it to get an ohms reading.

here is a print we did>
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

moamps

Re: Wire used in FM Detector Transformer?
« Reply #3 on: April 16, 2020, 07:02:45 PM »
It is speculation, but maybe this type of wire is used in order to linearize S -curve and additionally dump the Q of secondary of ratio detector.
Or maybe you should ask Paul :).

CJ

Re: Wire used in FM Detector Transformer?
« Reply #4 on: April 16, 2020, 08:54:06 PM »
we measured the small piece of this wire, about a foot,  it measures 0.006",  we extrapolated the ohms per 1000 ft, comes out to 272 ohms/1Kft  which equals #34 which measures 0.006",

so  not resistance wire,

i think you might be right, it is some type of silver alloy with enough mixture of another element to make it slightly magnetic. it does have a coating, the turns were wound right on top o each other.

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

Gus

Re: Wire used in FM Detector Transformer?
« Reply #5 on: April 16, 2020, 11:17:01 PM »

CJ

Re: Wire used in FM Detector Transformer?
« Reply #6 on: April 17, 2020, 12:39:10 AM »
Thanks Gus! I will look into that.
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: Wire used in FM Detector Transformer?
« Reply #7 on: April 17, 2020, 01:20:37 AM »
Looks like you were right Gus!

Electrisola makes it, used for RF,

https://www.elektrisola.com/conductor-materials/plated-wires/nickel-plated-copper.html


comes in #34,  any type of insulation or bare>

« Last Edit: April 17, 2020, 01:26:21 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: Wire used in FM Detector Transformer?
« Reply #8 on: April 17, 2020, 07:15:57 AM »
how does this plating stuff work?

pretty straight forward, just develop an expression for the complex impedance and use Cramers Rule.   :o

https://rc.library.uta.edu/uta-ir/bitstream/handle/10106/24069/Scully_uta_2502D_12395.pdf?sequence=1

like so>
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

 

Related Topics

  Subject / Started by Replies Last post
7 Replies
2594 Views
Last post November 13, 2004, 12:40:46 PM
by SSLtech
5 Replies
3661 Views
Last post September 05, 2009, 04:18:57 PM
by PRR
1 Replies
2695 Views
Last post April 23, 2013, 08:01:10 PM
by ioplex
8 Replies
2502 Views
Last post July 02, 2013, 10:45:02 PM
by PRR