Dr. Phybes low volume (solved)

[Oscar Lamas]

I am wondering if anyone has encountered this issue. I built a Dr. Phybes, got the paired quad set of transistors and the pedal does phase. The issue is that when engaged, the volume drops by quite a bit. I know that is is an inherent issue with some older phase pedal designs, but it is quite a drop. Has anyone experienced this? Any thoughts at all would help. Again, overall the pedal works fine.

Thanks in advance.

<h2 class=”single-post-title product_title entry-title”>Dr. Phybes</h2>

[Billy]

Post some pics so we can clearly see all component values and orientation

It could be a number of things causing low output poor in or out jack connection, incorrect value for the 150K mix resistors etc

[Oscar Lamas]

Thanks, here is what I have.

[Billy]

Everything that I can see looks correct

Do you have an audio probe to try and locate where volume drops out

Post all you IC and transistor voltages

[Oscar Lamas]

Solved.

Hi Billy, I appreciate your help. I found one of the Q5 socket pins was not soldered at all. This fixed the issue.

Thanks so much. Sounds great.

[Author]

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