Alper Yilmaz
New member
I am looking for the schematic for Custom Audio Electronics V-Comp. Does anyone happen to have it? This is an optical tube compressor with Threshold and Gain controls. The tube is a 12AU7 by Electro-Harmonix.
The issue with the pedal is, when the Threshold is at 0 level, it can be used as a clean boost pedal and it really sounds amazing. However, as I start turning the Threshold clockwise (as it starts compressing the signal) it starts distorting when the compressor kicks in; that is, there is no distortion when the signal is not strong enough to go above threshold.
I do not think it has anything to do with the gain stage. When the Threshold is set at 0, there is no distortion even is you can crank the Gain up. I do not have any extra 12AU7, but when I swapped the tube with an 12AX7, the problem is still there and maybe even with less headroom, as 12AX7 has higher gain.
By the way, the optocoupler is a VTL5C4 (442 PRC). I know this much of information is far from being adequate to troubleshoot, but what do you think I should look into. How likely is it the optocoupler? How likely is it part of the circuit for the preset Attack and Release levels?
Thanks,
Alper
The issue with the pedal is, when the Threshold is at 0 level, it can be used as a clean boost pedal and it really sounds amazing. However, as I start turning the Threshold clockwise (as it starts compressing the signal) it starts distorting when the compressor kicks in; that is, there is no distortion when the signal is not strong enough to go above threshold.
I do not think it has anything to do with the gain stage. When the Threshold is set at 0, there is no distortion even is you can crank the Gain up. I do not have any extra 12AU7, but when I swapped the tube with an 12AX7, the problem is still there and maybe even with less headroom, as 12AX7 has higher gain.
By the way, the optocoupler is a VTL5C4 (442 PRC). I know this much of information is far from being adequate to troubleshoot, but what do you think I should look into. How likely is it the optocoupler? How likely is it part of the circuit for the preset Attack and Release levels?
Thanks,
Alper