Hey folks,
After realizing today that the existing 'effect loop' on this amp is not suitable for my intended use with a compressor (because it's between the pre-amp and the endstage, changing volume directly affects the output level, and hence requires constant re-adjustment of any effect in and output levels), I've come to the conclusion I need to do some modding. I hope there's some like-minded folks here who can chime in on this as I'm more at home with digital circuitry than analog.
Now before anyone cries 'don't ruin it', I'll state that I want to keep everything fully reversible.
What I want, is to add a buffered tuner out jack, and a fixed-level effect loop that is in front of the volume pot. What would be the best way of going about this?
I was considering simply removing the original pre-amp out and power amp in jacks, and installing wired jacks upside-down, but I suspect there would not be enough clearance between the PCB and the jack housing. What I am thinking about, is to replace the rear grille on the unit with a custom one, that has space for mounting three jacks (and possibly a speakon to update the speaker output from Jacks).
Now creating a good quality voltage follower with an op-amp for the tuner out is no big deal. However, the effect loop is more interesting. I would think most rack compressors would require line level, not instrument level signal, so another OP-amp circuit pair seems to be in order, (one to amplify output to the compressor, one to attenuate the return signal without degradation) however what I would like to do, is that if the loop is not used, the op-amps should stay out of the audio path.
Any chance any of you guys has done something like this before? What is the best way to go about this circuit-wise?
Cheers!
After realizing today that the existing 'effect loop' on this amp is not suitable for my intended use with a compressor (because it's between the pre-amp and the endstage, changing volume directly affects the output level, and hence requires constant re-adjustment of any effect in and output levels), I've come to the conclusion I need to do some modding. I hope there's some like-minded folks here who can chime in on this as I'm more at home with digital circuitry than analog.
Now before anyone cries 'don't ruin it', I'll state that I want to keep everything fully reversible.
What I want, is to add a buffered tuner out jack, and a fixed-level effect loop that is in front of the volume pot. What would be the best way of going about this?
I was considering simply removing the original pre-amp out and power amp in jacks, and installing wired jacks upside-down, but I suspect there would not be enough clearance between the PCB and the jack housing. What I am thinking about, is to replace the rear grille on the unit with a custom one, that has space for mounting three jacks (and possibly a speakon to update the speaker output from Jacks).
Now creating a good quality voltage follower with an op-amp for the tuner out is no big deal. However, the effect loop is more interesting. I would think most rack compressors would require line level, not instrument level signal, so another OP-amp circuit pair seems to be in order, (one to amplify output to the compressor, one to attenuate the return signal without degradation) however what I would like to do, is that if the loop is not used, the op-amps should stay out of the audio path.
Any chance any of you guys has done something like this before? What is the best way to go about this circuit-wise?
Cheers!
