SIT-3 vs F8
The F8's power @ 8ω is 25W against the SIT-3's 18W, its power @ 4ω 15W against 30W, its damping factor 40 against 30, and its output impedance 0.3Ω against 200Ω.
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$3,228
Around — community and catalog average, updates slowly
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.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 18W @ 8Ω
- Power @ 4Ω
- 30W @ 4Ω
- Amplifier Class
- A
- Damping Factor
- 30
Analog Output
Analog signal output specifications
- Output Impedance
- 200Ω
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 431.8 × 171.45 × 406.4 mm (W × H × D)
- Weight
- 14.515 kg (32 lbs)
Key Specifications
Power: 18W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions