Phase 90 debug

[Keeb]

So, i built the Tonepad phase 90 ( http://www.tonepad.com/getFile.asp?id=42 )
I haven't substituted any parts (I've used a log pot and wired it as a rev. log but that can't really matter).
I bought a set of matched FET's from Banzai and haven't got the right op amp to check the bias.
Problem? It sounds like a tremolo. Sound clip is at lowest rate and then at about half way up.
Download phaser.wav for free on uploading.com

What worries me is the varying voltages at Q5. I haven't seen them in any other Phase90 debug.

   Q1   2   3   4
G   1,11   1,11   1,11   1,11
S   4,38   4,38   4,38   4,38
D   4,35   4,33   4,37   4,35

Q5

http://www.fairchildsemi.com/ds/2N/2N4125.pdf

C 1,78-2,34
B 3,78
E 4,38

======================

TL072BCPE4

http://focus.ti.com/lit/ds/symlink/tl072b.pdf

IC1

1 4,39
2 4,39
3 2,96
4 0
5 3,78
6 3,84
7 2,75-5,18
8 8,52

IC2

1 4,39
2 4,39
3 4,39
4 0
5 4,34
6 4,39
7 4,39
8 8,55

IC3

1 4,39
2 4,87
3 4,37
4 0
5 4,34
6 5,03
7 4,39
8 8,55

================

D1
A 8,53
K 0

D2
A 4,38
K 0

[Keeb]

Really, no one?

[jdub]

Obvious, but do you have the correct pinout for the 4125?  And checked for solder bridges (especially near Q5 emitter on tonepad layout, 150k resistor off of pin 5 of IC1, or between E & B on Q5)?  I'd check there scrupulously first... also might wanna look at pins 5 & 6 of IC1, IIRC you should have swing there.