Thanks for the info. I’ve found a few Q-trons and the only difference I can see is the knobs. Just wondering how many iterations of the plain vanilla Q-tron there is and if there are significant differences btwn them.

How’s the old Dr Q ? Isn’t that a Q-tron with a fixed depth?

EDIT: Thanks for the info. Pulled the trigger on one.

Got my Q-Tron. Quick questions…
It’s a RI, looks to be true bypass. Is that stock?

There’s a screw on the backplate that doesn’t connect to anything. Am I missing a ground connection or is that just something that’s used on another pedal with the same enclosure like a DMM or EM?

Thanks for the info. It is a fun box…it totally changes the way you play. Just for fun, I ran an octave multiplexer in front of it, and couldn’t help but play some Bootsy.

I’m trying to decipher the switch layout to wire the LED as an on/off indicator rather than just a power indicator, which would be more useful.

Here’s the switch (same orientation as the full pic above):

Labelled like this:

1  2  3
4  5  6
7  8  9
|____|

#1 goes to the circuit board
#4 is the input (?)
#7 & #9 are jumpered together
#3 goes to the circuit board
#6 is the output

The info I found is this but it’s a bit ambiguous — can anyone clarify?:
“To get the LED to only come on when the effect is on, splice into the LED’s ground (black) wire, solder the wire coming from the circuit board to #2, and the wire going to the LED to #5.“

Thank you! That looks about right.
I’m going to get the old soldering iron out right now and try it.
EDIT: It worked. So for future reference.

EHX Q-Tron LED mod
Stock, the LED is a power on indicator only — not an effect on indicator. To make the LED light only when the effect is on:
1. desolder the black wire coming from the LED at the top right corner of the board (2nd pad in).

2. With the switch labelled like this (lugs 7 and 9 are jumpered together):

1  2  3
4  5  6
7  8  9
|____|

Solder the free end of that black wire from the LED to lug #5.

3. Add a new wire from the pad on the board that the black wire was connected to, to lug #2 on the switch.

Labelled photo before:

Photo after (added wire is grey):

Here’s the switch: