mas maganda yung bago hehehe.... parang may makati tuloy sa batok ko.
yung driver tube sa gitna ang naiba.... di ako sure kung ano yun, maaring linestage or buffer.... pero pwede rin kaya na yun ang ginamit ni andrew as the feedback triode?
nabasa ko kasi about STC...
"...uses triode as feedback path device instead of a conventional (sic) resistor. By this method the STC adopts the triode's performance characteristics, so you get the sonic of the triode used with a low plate resistor, even if you actually are employing a pentode, beam deflection tetrode or even a transistor, as power output (current amplification) device."