Hartke LH500 Bass Amplifier Tube (12AX7) Preamp, Bass and Treble Shelving with peak Mid-Range 500 watt Bass HeadLH500 Bass AmplifierThe LH500, like its big brother, has a classic 12AX7 Class A tube front end design with a solid state output. Developed with the HyDrive cabs in mind, the LH500 also has more than enough power and tone control to drive any cabinet on the market. This amp provides you with Treble and Bass Shelving to give its warm tone a little edge. Or use the brite and limiter switches to further sculpt your sound. Its intuitive front panel also