Gyraf pultec problems
« on: October 17, 2005, 09:53:49 PM »
My bass and high freq sections are working just fine but I can't get the mid to work. I bought the cinemag inductor, didn't work,  then I  DIYed the inductor, didn't work, and then I bought the mouser inductors and still doesn't work.  I have traced audio through the whole network, pulling out components and hacking up the traces.  I get clean audio at every point I would expect it.  But the mid freq has no effect on the signal.

What have I done wrong?

"The smoke from the flux is filling my lungs..."


Gyraf pultec problems
« Reply #1 on: October 17, 2005, 10:05:43 PM »
What kind of tools do you gots?
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page:
Guitar Amps:


Gyraf pultec problems
« Reply #2 on: October 18, 2005, 09:05:39 PM »
Tools I am using:

old heathkit scope
fluke true RMS meter
protools used as a tone generator.  

I pulled the 1 meg resistor, and ran signal through.  I traced the signal all the way through the mid section.  

I had to cut some traces when I tried the Cinemag inductor because it has a tap for every freq.  But then I soldered the the traces back together, so to speak, using some clipped leads when I tried the other inductors.

Anyway,  that was my experience,

"The smoke from the flux is filling my lungs..."


Related Topics

  Subject / Started by Replies Last post
22 Replies
Last post July 11, 2006, 05:20:21 PM
by clintrubber
8 Replies
Last post January 04, 2007, 02:23:21 PM
by rafafredd
2 Replies
Last post May 23, 2006, 04:51:14 PM
by rubric
786 Replies
Last post October 06, 2020, 01:21:57 PM
by Whoops