990 Op Amp
Overview
Product sourcing insights & recommendations
The 990 discrete operational amplifier, originally designed by Deane Jensen in 1980, remains the industry benchmark for ultra-linear, high-fidelity audio amplification. Unlike standard integrated circuits (ICs), the 990 is a discrete module optimized for professional recording environments where transparency and high current drive are paramount AudioxpressJohnhardyco.
Product Insights & Technical Profile
The 990 is engineered to provide "straight wire with gain," delivering a clean signal without the harmonic coloration typical of other discrete designs like the API 2520 GearspaceGearspace.
* Ultra-Low Noise: Features a noise floor as low as 0.89nV/√Hz, making it ideal for high-gain microphone preamplifiers Gearspace.
* High Headroom: Capable of operating at ±24V supply rails, significantly exceeding the ±18V limit of most monolithic ICs Johnhardyco.
* Class-A Design: The output stage operates entirely in Class-A, eliminating crossover distortion and providing stable performance into low-impedance (600Ω) loads or heavy output transformers Johnhardyco.
* Interoperability: Uses the standard 2520 pinout (6-pin), allowing it to be swapped into a wide range of professional audio gear, including API consoles and John Hardy preamps Sonicimagerylabs.
Market Trends & Outlook
The global operational amplifier market is projected to reach $15.88 billion by 2033 (CAGR 6.2%), with the precision audio segment seeing renewed interest in discrete topologies Ic-OnlineLinkedin.
* Shift to SMT Components: The discontinuation of legacy through-hole parts (like the LM394 matched pair) has pushed manufacturers toward Surface Mount Technology (SMT). Modern iterations like the Sonic Imagery Labs 990Enh-Ticha leverage SMT to maintain or exceed original performance specs SonicimagerylabsHairballaudio.
* Transparency over Coloration: While "vintage grit" remains popular, the 2026 trend shows a growing demand for ultra-linear transparency in A/D converter front-ends and high-performance summing mixers.
* DIY Growth: Kits from suppliers like Hairball Audio have made high-end discrete op amps more accessible to the boutique builder market, offering a 40-50% cost saving compared to pre-assembled units Hairballaudio.
Competitive Landscape & Pricing
Current pricing for 990-style op amps reflects their specialized, high-performance nature:
| Product Variant | Typical Price | Key Feature |
|---|---|---|
| John Hardy 990C | $60.00 – $75.00 | Industry standard for M-1 preamps Johnhardyco |
| Sonic Imagery 990Enh | $94.00 – $99.00 | Ultra-modern SMT design; highest specs Sonicimagerylabs |
| Hairball Audio DIY Kit | $45.00 – $55.00 | Affordable modern build with SSM2212 Hairballaudio |
Based on the 990 op amp trends, you can continue with:
990 Discrete Op Amp Professional Audio
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Sources & References
25 sources cited · Verified industry data & reports
DIY JE-990 Discrete Operational Amplifier
Hairball Audio
In addition to being designed for low noise, the JE-990 is a powerful op-amp capable of adequately driving a 75Ω load. Many commercial versions ...
Simulation of the JE-990 OP Amp By Deane Jensen
diyAudio
The 990 was first described in 1980 as a public domain design in the AES. Operational Amplifier" designed for use with Jensen transformers, ...
OPAx990-Q1 Automotive 40V Rail-to-Rail Input or Output, ...
Texas Instruments
These devices operate up to 40V supply rails and offer true rail-to-rail input or output, low offset voltage and offset voltage drift, as well as 1.1MHz.
990 OpAmps
Google Groups
You can check out the specs and some test data. The slew rate is > 60v/us. over about 1.5 k-ohm, operation is entirely Class A.
Opamps - A Short History
Elliott Sound Products
Released (by Analog Devices) in around 1990, this is an RF (radio frequency) opamp, but is more commonly 'restricted' to high-speed video applications.
990 Discrete Op-Amp | PDF | Operational Amplifier
Scribd
The 990 op-amp manages DC offset through innovative methods that eliminate the need for DC-blocking capacitors, which are traditionally used to prevent DC ...