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About the SIT-3
The First Watt SIT-3 is a stereo power amplifier designed by Nelson Pass, known for its innovative use of Static Induction Transistors (SITs). It operates in a push-pull Class A topology, combining a depletion-type N-channel SIT with an enhancement-type P-channel MOSFET to form a self-biasing power follower. This design provides both current gain and a square-law character similar to triode circuits but with more available current. The SIT-3 does not provide voltage gain, so it uses a high-quality auto-transformer to boost the preamp voltage by 11 dB, buffered by push-pull JFET followers to achieve an input impedance of 200 kΩ.
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