I bought this unit new, and probably used it for a few hours tops. I was really impressed, but life threw a curve ball at me, and I never got to utilizing it. So it's basically open-box new.

I have all the original packaging and documentation as you see in the photos. It's in excellent condition.

Here are the manufactures specs:

Rupert Neve Designs 511 500 Series Mic Pre with Silk

With a truly legendary transformer-balanced preamp and the flexibility of variable Silk / Texture, the 511 was designed by Rupert Neve to provide classic sonic performance with 500-series value. Incorporating the pristine preamp circuitry from the 517, the universally useful sweepable high pass filter from the 5012, and the sweetness of the variable Silk circuit derived from our flagship Portico II Channel, the 511 is a workhorse for all your most important tracks. 

MIC GAIN

-A 12-way precision rotary switch controls gain from 0 to 66 dB in 6 dB steps.

TRIM

-Continuously variable +/-6 dB level control.

+48V

-Engages phantom power on the microphone input, as supplied by the 500 series rack.

POLARITY

-Push button inverts the polarity of the signal path, and illuminates when engaged. The symbol “Ø” is often used to denote opposite polarity.

HIGH PASS FILTER

-The high pass filter is continuously variable from 20-250Hz and engaged by the HPF switch, which illuminates when engaged. It is a valuable aid in any signal chain, but particularly so in a microphone preamplifier. Signals below the selected frequency are attenuated at a rate of 12db / octave, getting rid of proximity effect, building rumble, air handling, motor hum, etc.

SILK / TEXTURE

-Pushing the Silk button engages the red Silk circuit, which reduces the negative feedback on the output transformer, adding harmonic content as the texture is increased. Red Silk accentuates the saturation in the mid and high frequencies, similar to that of the red silk mode on the Portico II Channel. By manipulating the Texture control, the amount of Silk can be changed from essentially absent, to roughly 10 times the amount of coloration / distortion found in Silk from the original Portico Series. With Silk / Texture engaged, the distortion characteristic and harmonic content of the unit are very reminiscent of many of Rupert’s class-A vintage designs.

LEVEL METER

-An Eight-segment LED bar-graph meter displays output level (pre-Silk). The color range proceeds from green for lower level signals, yellow for intermediate signals, and red for high levels. When the 511 is clipped, the highest red LED will hold longer depending on how far above the clip threshold the signal was.