Price $2000.00 In great shape with upgraded Cardas RCA and Speaker posts, 2 small scraches on top, can see in pic. Has been in storage since upgrade by vintage amp repair, maybe 4 hours on it. C
Prefer local pick up in so Cal. Irvine area, can demo. Can ship but price will be ridiculous, would need to build crate plus shipping cost at buyer's expense. Cash or Paypal via friend or you cover the 3%

The Nelson Pass designed Threshold S/500 was built from 1983-1988.
The Threshold S/500 is a solid-state stereo power amplifier known for its high power output and STASIS technology. It delivers 250 watts per channel into 8 ohms, with a maximum current output of 22 amps. The amplifier features a pure Class A voltage amplifier stage coupled to a Class AB current mirror, offering a balance of power and sonic neutrality.
Key Specifications:
Output Power: 250 watts per channel into 8 ohms (both channels driven).
Class of Operation: Class A/AB STASIS (STASIS = Static Stabilized Amplifier).
Frequency Response: 7Hz to 100kHz (-3dB).
Slew Rate: Greater than 50V per microsecond.
Input Impedance: 75k ohms.
Output Impedance: Less than 0.1 ohm (20Hz-20kHz).
Signal to Noise Ratio: -100dB, unweighted.
Dimensions: 19" W x 19" D x 9-1/2" H (approx. 48.3 x 48.3 x 24.1 cm).
Weight: 92 lbs (approx. 41.7 kg).
Output Transistors: 20 per channel.
Power Supply: 1000W toroidal transformer with 120,000 µF capacitance.
Output Current Capability: 12A continuous, 100A peak per channel.
Distortion: Less than 0.1% THD.
Gain: +26.6dB.




















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