In this case, instead of modding the amp, I think you can get a good bit more gain by using either a boost, an overdrive, or an EQ pedal in front of it. That's certainly gonna give you the "kick" you need.
I mention the EQ pedal because those can also boost your signal, and you can work the tone by adjusting the equalization.
If you don't have any of those, you can easily build a boost or an overdrive and there's tons of projects online.
I mention the EQ pedal because those can also boost your signal, and you can work the tone by adjusting the equalization.
If you don't have any of those, you can easily build a boost or an overdrive and there's tons of projects online.