John Hardy 990C 990C+

OUR PART #: 990C MFR #: 990C+

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The 990C+ discrete op-amp is among the finest op-amps available for audio applications. If you want superior sound quality, the 990C+ can provide it. ...Read more

John Hardy 990C 990C+ Image 1
John Hardy 990C 990C+
Our Price: $53.85
List Price: $54.95
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Product Overview

The 990C+ discrete op-amp is among the finest op-amps available for audio applications. If you want superior sound quality, the 990C+ can provide it. The 990C+ is used in the most critical audio applications. Leading recording studios, remote recording companies, disc and CD/DVD mastering facilities, and TV and radio stations use the 990C+ for superior performance. Several mic preamp products using the 990C+ are available from The John Hardy Company.

Product Update: In January of 2013, manufacturing of the 990 was converted from through-hole assembly to surface-mount assembly. Many improvements in components were made. The basic circuit and package dimensions remain the same, but the name has been modified to "990C+" to signify the changes. See technical information sheet for details.

Specifications (990C+ 0dBu = 0.775V)

  • Open-loop gain, DC to 30Hz: 125 dB
  • Gain error at 100dB gain: 0.4 dB
  • Noise-voltage spectral density:
    • each transistor: 0.8 nV/vHz
    • differential pair: 1.13 nV/vHz
  • Noise current spectral density: 1 pA/vHz
  • Noise index: 1kOhm source resistance: 0.6 dB
  • Equivalent input noise voltage:
    • 20kHz bandwidth, shortedinput: 160 nV
    • Corresponding voltage level: -133.7 dBu
  • Maximum input voltage at unity gain: 13.8 V
    • Correspondingvoltage level: +25 dBu
  • Input impedance, non-inverting input: >10 M Ohms
  • Input bias current: +2.2 µA
  • Maximum output voltage:
    • RL = 75Ohm 13.8 V
    • Corresponding voltage level: +25 dBu
  • Maximum peak output current: 260 mA
  • Total harmonic distortion at 20kHz:
    • VOUT = +24dBu
    • RL=75Ohm, gain = 40dB: 0.06 %
    • RL =75Ohm, gain =20dB: 0.005 %
    • RL =600Ohm, gain = 40dB: 0.015 %
  • Slew rate, RL = 150Ohm: 18 V/µS
  • Slew rate, RL = 75Ohm: 16 V/µS
  • Large-signal bandwidth:
    • RL = 150Ohm: 145 kHz
  • Small-signal bandwidth:
    • at unity gain (ft): 10 MHz
  • Gain-bandwidth product:
  • Phase margin at 10MHz: >38 deg
  • Phase margin at 60 deg
  • Response time at unity gain:
  • Supply current with no load: 25 mA

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

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Product Reviews

Reviewed by 2 customers
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Larry H on 03/28/2019 Verified - This reviewer has purchased this product

A 990A blew on my John Hardy mic pre. This is a drop in replacement. Works fine.

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Dennis H on 11/23/2018 Verified - This reviewer has purchased this product

My reference for sound is vacuum tubes driving DeVore speakers in a small room. While I have not spent my complete life savings on sound and music equipment I have come pretty close. It came time for me to design or buy a mixing board so I went to Los Angeles and listened to most of the brands. First, they were all tipped up in the treble. Second, they did not sound realistic based on my reference to recorded sound. By reference I mean I want to hear the bass notes like I experience with my band, and be able to groove to the music. What was termed "analytical" to me was an ice pick in the ear. Music should be fun and pleasurable, not a chore. I have been designing and building sound equipment for some time now, so it was not too difficult to build a test circuit that would be called a monitor controller in pro audio and a line stage in high end audio. While vacuum tubes/valves sound the best, they are out of the question for a mixing board. All that was left was to play music through the test circuit and listen to all of the op amps available. To my ears there was no question of the John Hardy 990's superiority to every other op amp including other 990 derivatives. I believe the bass is the hardest thing to reproduce. Here the 990 was the guy who consistently reproduced those lowest notes in a pleasing and believable manner. It will reproduce what you give it, so if the sound sucks it will let you know. If the music is perfect then you will get its message. Note: I tuned the half power points in the circuit to 0.159Hz and 80Khz, and used a single Mundorf coupling capacitor. The treble and mid frequencies were well suited to my ear: revealing enough, yet not fatiguing after a long listening session. As the old cliché says, "You get what you pay for." If a $0.50 op amp will float your boat, or you think at 100 times the cost a $50.00 op amp is jive, then that's what your ears are telling you. Dennis Hoffman

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