Pass Labs First Watt SIT-1 Mono Power Amplifier
The SIT-1 is the first of a new generation of power amplifiers using Static Induction Transistors (SIT) in single-stage, single-ended Class A circuits delivering superlative sound without feedback or degeneration. This is made possible by the unique characteristic of First Watt's custom SIT devices, which combines a square-law input character with a low impedance output to form the only solid state gain device which behaves like a Triode tube.
This character has long been sought as a potential replacement for tubes, but the realized devices have several advantages. The Pass SIT device has higher gain and lower distortion and also conveniently operates at the voltages and currents required by loudspeakers. This means that an output transformer, with all its bandwidth and distortion limitations is eliminated.
Measured at 120 V AC and an 8 ohm load:
Distortion @ 1 watt 0.7%
Input Impedance 10 Kohm / 100 Kohm
Gain 18 dB
Output Impedance 4 ohms
Output power 10 watts @ 5% THD, 1KHz
Frequency response 4 Hz to 500 Khz (-3 dB)
Noise 150 uV unweighted, 20-20 KHz
Power consumption 200 watts
Fuse 3AG slow blow type - 2.5 Amp for 120VAC, 1.25 Amp for 240 VAC
Weight 32 lbs
Dimensions 17” W x 15” D x 5” H
Colours Black or Silver