Amplifier Specs:
Power Output: 40 Watts (6V6), 30 Watts (EL34)
Output Tubes: 4 x 6V6, or 2 x EL34
Preamp Tubes: 3 x 12AX7
Rectifier: 1 x 5AR4 or 1 x 5U4
Controls: Volume, Treble, Bass, Presence, Master

Greer's Thunderchief, coming out of prototyping, runs a 4x6V6 or 2XEL34 power section - cathode biased, ECC83 phase inverter, 2 12AX7 preamp.

Controls are Volume, Treble, Bass, Presence, and Master. This amp has a huge Voxish tone with it's very own flavor - truly its own thing! Pull the quad of 6v6's and install a pair of EL34's instead. No biasing!