Vetsen

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?

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


CJ

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: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

Vetsen

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,

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


 

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