The successor to First Watt’s SIT-1 and SIT-2 amplifiers is now going into production. Like them, the new SIT-3 uses a Static Induction Transistor (VFET) in the power stage of a simple no-feedback amplifier.
The SIT-1 and 2 operated the SIT device in Common Source Mode, which delivers both voltage and current gain. The SIT-3 operates in Common Drain Mode, which delivers only current gain.
Nelson Pass says: “While a lot of people love them, the SIT-1 and SIT-2 have the kind of distortion figures (deliberately) that the ‘Measurements-are-God’ folks would shake their heads at. The SIT-3 has 1/5 the distortion, so is more mainstream.”
SIT-3 Specifications
Maximum output 18 watts @ 8 ohms,
30 watts @ 4 ohms
Input Impedance 200 Kohms
Gain 11 dB non-inverting phase
Damping Factor 30
Frequency Response 10 – 50 Khz – 3dB
Suggested Retail Price $4,000
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