"In 1961, a new Princeton (6G2) of fundamentally different design was introduced, which instead of being essentially an upgraded Champ was more like a junior Deluxe.This "brownface" version used a single 7025 dual triode in the preamplifier; a 12AX7 dual triode, one half of which operated a tremolo oscillator and the other half of which served as a split-load phase inverter; and two 6V6GT tubes, which were fixed-biased in Class AB push-pull configuration in the power section.