Nice rig, I've used a TH with several Bergantino and Barefaced cabs for the past three years and it has always sounded good with any of them. Great amp.
Actually the secret to the TH is the Drive control. It is not a typical Over Dive (although it does have some gain). Rather it is a variable High Pass Filter and Low Pass Filter in one (and yes it does interact with the Gain control). There are some good graphs in the mega-thread that explain what the Drive is doing. These explain it better than the manual that just says:
The Drive control changes the gain structure and EQ interactively with the GAIN control position. By modifying the circuit structure, Drive gives a "vintage voiced" EQ and gain structure that adapts to how you set the GAIN control. The lower the GAIN control setting, the "flatter" the EQ applied. The higher you set the GAIN control, the more saturated the gain structure becomes, and the more the bass is tightened and the treble smoothed.
The Drive circuitry surrounds the midrange controls, enabling you to get a huge variety of tonal characteristics by simply adjusting the GAIN, MID LEVEL and MID FREQ controls.
Aguilar - Official 'Tone Hammer 500' 3.8lbs 500w Megathread!
The other unusual feature of the amp is that the Bass is set very low at 40hz.