Mine already sounds good on the clean side. But to get the tonal range and specific overdrive I want I have to go a little deeper. Even with a tube change the opamp front end tends to be a little sterile and compressed. I need it to breathe better and have a better presence than it does now. I was going to leave the opamp but realized that replacing it with a better preamp circuit would be easier and give me better control. And I wanted a gain/volume setup to control the overdrive at lower volumes probably because that is just what I'm use to.