Problem with GGG Orange Squeezer

[martinpg]

Hi - I'm having difficulty with with a GGG kit: the OSQ (Dan Armstrong) replica. The assembly was pretty straightforward, but I cannot get it to have any effect on the guitar sound. As far as I can tell, the problem maybe in the area of the OP amp - I have the following voltages on the 5, 6, and 7 pins that don't look right:
5: 1V
6: 2V
7: 6V

The circuit looks OK and I cannot see any shorts, and so any suggestions would be welcomed at this point. Thanks in advance, Martin

[GibsonGM]

What is your supply voltage?  How about voltages on the 2N5457? Is it in correctly (right orientation)?  Please post a link right to the schematic you used so we don't have to go hunting.....I have a schem, but it's not GGG and the pin #'s are different (using the other 1/2 of the opamp).
 
Does it boost the signal if you turn the knob up?  The OS will give you LOTS of volume gain, a little bit of OD, but not a whole lot else....I use mine to boost for solos!  Not a lot of modern-type 'compression', really...

[oldrocker]

Which diode did u use?

[martinpg]

Hi, and thanks for taking an interest! The schematic for this stompbox is at:
http://www.generalguitargadgets.com/pdf/ggg_osq_sc.pdf?phpMyAdmin=4a28f86a515b7883e7bc35a68d4e7b6d

I am using a 9V power supply.

I measured the voltages off the two 2N5457 transistors and they are as follows (I've included the voltages suggested by GGG in brackets):

Q1: Gate: 2.6V (2.4)
      Source: 4V (4.0)
      Drain: 9V (8.
Q2: Gate: 0V (0.6)
      Source: 3V (2.6)
      Drain: 1V (2.1 to 2.6)

So it looks like there is a problem around the Q2 (though I'm not sure how this would affect the IC voltages). I am pretty certain that the JFETs are in correctly (both from the schematic and the picture provided by GGG). Turning the knob up does give a lot of volume, but nothing I do affects the guitar sound.

I am using the diode that came with the kit - a 1N100 germanium diode. Thanks for any help, Martin

[R.G.]

There's actually a reason for all the data requested in that "Debugging Thread: What to do when it doesn't work" stickie.

The data that's requested tends to solve a whole lot of problems. It's really helpful to have it all at once.