Threshold S/500 Power Amp(STASIS Class A/AB Optical Bias)Unit powers on and we played music through it using a turntable & preamp. There was some hum, but I dont know what caused it - perhaps a grounding issue? Regardless, we make no guarantee that it is performing to spec. Cosmetically near perfect, a few light scuffs or scratches. Original manual & warranty card included. (See statement below.)This is a beast; therefore, shipping is not cheap! Due to the weight, we respectfully decline overseas offers. ___________ Naucks Vintage Records is the worlds premier company dealing in vintage 78rpm & cylinder phonograph recordings (1890-1960). Though we have bought and sold internationally for 40 years, we DO NOT specialize in vintage audio. That being said, we often have the opportunity to pick up nice equipment when we purchase record collections. All such items are gently cleaned, and (assuming they appear safe) we check to see if they power up. If we have the ability to test basic functionality, we will do that as well. If a component appears to be functional, we will make a statement to that effect. However (unless otherwise specified), we DO NOT guarantee that any piece of equipment is performing to spec, or that all controls and/or features are fully functional. To be honest, we have no idea what many of these features even mean, much less do we know how to properly engage and evaluate them. (We understand on/off, volume, balance & tone controls - maybe a few more. Anything beyond that is questionable!) We will also describe cosmetics, the presence of original paperwork and/or packaging and anything else that appears to be relevant. If you have questions concerning any item we offer, please ask. We will try to answer to the best of our ability.Check, money order, credit card or Paypal accepted.

This is a box, with outer box, with foams only, nothing else. Original box for Threshold amplifiers. Fits S/500, S/450e, SA/1,S/1000. Foams are in good condition. The most important part of this original box, is the custom crush resistant forms that are made to fit the amplifier properly for safe shipping it, so that the front, back, and heat sinks are well protected during shipping. This box is a must, if you someday plan to ship your amplifier someplace.

This is a box, with outer box, with foams only, nothing else. Original box for Threshold amplifiers. Fits pair of SA/1, S/1000, S/500, S/450e. Foams are in good condition. The most important part of this original box, is the custom crush resistant forms that are made to fit the amplifier properly for safe shipping it, so that the front, back, and heat sinks are well protected during shipping. This box is a must, if you someday plan to ship your amplifier someplace.

Threshold S500 250wpc Class A A/B State of the Art Power Amplifier. Specifications Power output: 250 watts per channel into 8? (stereo) Frequency response: 7Hz to 100kHz Total harmonic distortion: 0.1% Gain: 26.6 dB Signal to noise ratio: 100dB Semiconductors: 20 x transistors per channel (output) Dimensions: 8.72 x 19 x 17.125 inches Weight: 78.5lbs Year: 1983 This amplifier was designed by the esteemed Amp Designer Nelson Pass.Selling $2,400

Threshold S500 250wpc Class A A/B State of the Art Power Amplifier. Excellent condition no scratch clean Sound not abuse. Smoking free. listen to music. May be one hour every two weeks. It’s been checked. Everything good any questions please free to ask no shipping the reason no shipping pick up only I want you to judge for yourself not accuse me Not honest person