The Chieftain preamp utilizes two 12AX7's for its interactive tone and two 12AX7's for the reverb circuits. This highly flexible preamp circuit is enhanced by a very active mid control. The preamp section is coupled to a pair of EL34's power tubes via a 12AX7 phase inverter for tremendous power reserve. Exceptional sound pressure levels can be attained with no appreciable loss of tone. Additional features include an effects loop and a switchable output impedance (4, 8, 16 ohms). User controls include Volume, Bass, Mid, Treble, Brilliance, Master Volume, and Reverb