I just got a new Nano Doctor Q in the mail today and am experiencing the same problem. With the toggle switch up (bass mode) it’s not quite unity gain. With toggle down, huge volume drop – can’t be normal…

I removed the battery and hooked it up to my Pedal Power 2+ (9v, tip negative) same problem.

I’m plugging guitar, into Doctor Q, into amp – so nothing else in the chain.

Cool!

I’ll give it a whirl.

thanks.

V
Just to make sure, the Doctor-Q Re-Issue = Nano Doctor Q… right?

That is indeed the trim pot, thats how they look (the arrow shaped adjustment screw) in the pedals I have taken apart so far.
My Q, which I took apart, is the normal sized wedge box, but internally it looks like the same trim pot. If you take the whole chip out, and look at the other side, it should be labeled “TRIM 100K”. The unit that houses the white adjustment screw looks like a small bead. Mine is white, but the nano soul preacher has a black one.

Let me know your results with this, I am curious.

This is the first we are hearing about a volume problem on the Dr. Q. We have to look into it.

Flick – When I first got this pedal, I didn’t notice the cut because I thought it was just the filter. I first became wary when I used the Q after a distortion pedal. I liked the sound I was getting, but when I turned the Q off, I was surprised at how much volume was being cut – I had to keep the volume on the distortion cranked to get enough signal through the Q.

That was before I tweaked the trim pot, now it sounds quite nice. I was wondering if you can address the use of these internal trim pots – by which I mean, what was EHX’s logic in making them internal controls? I can only imagine that they are placed internally because:
A ) They control a minute piece of the effect that would be too sensitive to mess around with as an external control
B ) It is cheaper to install the small ‘bead’ potentiometer than it is to build a pedal with another proper potentiometer, requiring another hole in the pedal and another knob.

I imagine it is more a combination of these two causes. I am curious as to how much the price would increase for the consumer if these additional knobs were external. Do any of the knobs on the QTron and other more advanced envelope filters mimic the behavior of the Dr. Q internal trim?

Vorvick – I may join the gear page, but please go ahead and link them to this or copy/paste my fix instructions.

Nano Q users – What does your trim pot say next to it? MY nano soul preacher says “TRIM 10K”, but the trim pot on my big Q says “TRIM 100K”. I don’t know what kind of “normal” potentiometer I would need in order to replace these

Click on the photo so it’s full size

The circuit board has a hole in it – look in the upper right corner. (It’s in about 45 degrees from the screw hole)

Inside the hole you can see the white screw or pot or whatever it’s called, and you can partially see the arrow shaped slot for the screw driver.

If you have a nano dr q, it might be easier to just open it up.

V