ROG New Clipper problems

[superferrite]

Hey!  It'd my bi-weekly "What did I screw up on NOW?" thread!
Built the ROG New Clipper  using the vero layout on this page:
http://www.indyguitarist.com/torchy/Distortion_Overdrive/ROG%20New%20Clipper/ROG%20New%20Clipper.gif
I used the parts listed but my trusty electronics store handed me a  NTE858M  op-amp instead of the TL072 and said it was a good sub.
The pinouts on the two are the same and I couldn't find out otherwise so...
Voltages are:
Battery alone 9.72v/in circuit 8.95v
Pins:
1=9.58v     8=8.95v
2=8.97v     7=7.26v
3=8.97v     6=0.09v
4= 0.0v      5=0.0v
diodes are 1n914
D1 A=.14v  K=0.0v
D2 A=0.0v  K=0.07v
If the chip is ok, I think it might be some of the resistors--I used some old carbon comps for the 22k and the 8k2.

THANKS FOR YER TIME AND STUFF GUYS!!!!!!!!!!!!!!!!
Youse guys rock!

[petemoore]

  Looks like the right side of the OA is unused.
  And all the relevant pins seem to be very close to supply voltage, check what voltage the voltage divider is [the two 22k resistors].
  If the chip is ok, I think it might be some of the resistors--I used some old carbon comps for the 22k and the 8k2.
  resistors hardly ever ever fail, and can be measured for actual resistance.
  chips...always seem to work unless something caused them to fail [reverse voltage, overvoltage ]

[the recluse]

Take a look at the original article on ROG.  It may be that the 22K resistors aren't biasing the opamp properly.  Try increasing the values of those and see if that's the problem.  I built one of these on a tonepad PCB and replaced the biasing resistors with a 100K trimmer (again from the ROG article).  I found that this doesn't provide a huge range to make the circuit work optimally, and if the value was lower than 100K I couldn't make it work at all. 

[Mick Bailey]

FWIW this makes a really versatile variation on that circuit. Use an LF351 for totally excellent results. The .022uf cap across the volume pot tames the highs, you might want to experiment with this.

http://www.avwz35.dsl.pipex.com/clip-o-rama.jpg

[superferrite]

Thanks for the replies.  I checked the resistors as suggested and one of the 22k carbons was bad.  I socketed the biasing resistors and got a nice sound out of two 1M and a single green LED on the clipping section.  SWEET!  As in the band the Sweet, that is!

Thanks guys.
Tony