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




Read More Posts Like This

  • Outwardly, the new Audio Research Reference 80S Stereo Power Amplifier shares the same dimensions as the ARC 160M. A single shallow whisper fan is built into the bottom plate. Flexibility is built-in, too, with XLR and SE inputs, 4-8-16 ohm output taps, 12V input and output triggers, RS232 input, tube hour meter, switchable fan speeds, and defeatable auto-off function. GhostMeters…

  • The Power Two is Alluxity’s second stereo amplifier and a visual match for the Pre Two preamplifier. Alluxity is the brainchild of Alexander Vitus-Mogensen (AVM), the son of Hans-Ole Vitus of Vitus Audio. Over the course of many years, Alexander learned the ropes of high-end, high-performance, and vertically integrated manufacturing. As a result, Alluxity performs all engineering, development, and manufacturing…

  • Benchmark AHB2 Power Amplifier

    There’s a huge problem with HD music today say Benchmark and recent advances in high-resolution digital formats have well outpaced most existing amplifier technologies they say. Whilst recordings are possible that have dynamic ranges that exceed 120 to 125 dB Benchmark claim it’s hard to find a power amplifier that can deliver more than 100 to 105 dB of dynamic…

You must be logged in to leave a reply.