Electrical Audio EApreq500 - 500 Series Mic Preamp/EQ - Like New in Box s/n #021

Electrical Audio EApreq500, the 500-series version of the EAPreQ preamp and EQ that Electrical Audio has built in Chicago since 2011. Hand-built, transformer-based, simple to use, and very quiet. About the maker: The EApreq500 was designed by Greg Norman, longtime engineer and co-operator at Steve Albini's Electrical Audio in Chicago, and hand-built by the studio's crew. It's the 500-series version of the EAPreQ that Norman created in 2011 for use at Electrical, and it has been in use there ever since. It pairs a Lundahl input transformer with a low-noise FET gain stage, and the idea is to let the transformer add subtle color without adding noise or distortion. Tape Op reviewed it and called it a studio workhorse. Condition: Like new. I’ve owned it for about 2 years. It has lived in the original box and packing since. No wear, no marks. Comes with the original box and info card. Features: Lundahl’s best microphone input transformer -20dB input pad switch - sealed gold contact relay Polarity reverse switch - sealed gold contact relay across the output for quietest operation 48v phantom power switch - standard application 16-position, gold contact rotary gain switch, ranging from 20 to 65 dB of gain, with 3 dB per step Low and high-frequency shelf boost EQ - Controlled with a solid multi-section gold contact switch, with 5 gain positions. A sealed relay bypasses the EQ circuit when not in use. DC servo for both preamp gain and shelf EQ make-up gain amplifiers. This ensures long-term predictable operation and sound quality, avoiding the gradual decline associated with electrolytic capacitor-coupled circuitry Ground-sensing solid-state balanced output amplifier, capable of driving 600Ω loads with ease, balanced or unbalanced Clear green LEDs indicating which shelf band is engaged. Bright, amber colored "peak" LED signal just before clipping. TECHNICAL SPECIFICATIONS FREQUENCY RESPONSE ± .5dB from 7 Hz to 102 kHz (3dB down @120kHz) MAXIMUM OUTPUT LEVEL= +27dBu Balanced 10kΩ Termination (typical modern equipment inputs) +26.5dBu Balanced 600Ω Termination (“vintage” input impedance standard) +21dBu Unbalanced 10kΩ Termination NOISE AND DISTORTION THD+N (1kHz, 35dB gain) ≤ .003% THD+N (30Hz, 35dB gain) ≤ .012% IMD (50Hz/7KHz) ≤ .0015% Noise floor (22- 22kHz unweighted, lowest gain setting) ≤ -99dBu Noise floor (22- 22kHz unweighted, EQ engaged) ≤ -86dBu Equivalent Input Noise = (44dB gain, 150Ω input source, no EQ) ≤ -128dB Power Consumption is typically < 50mA per 16 volt rail, and < 100mA per rail in the extreme (1kHz sine wave @26dBu into a 600Ω load, all relays on). Ships insured in its original box. Reasonable and respectful offers welcome.