Model 990Enh-Ticha Discrete Operational Amplifier

The Model 990Enh-Ticha is a high performance discrete operational amplifier designed for professional audio application areas where ultra-low noise, low distortion and highly linear uncolored operation is required. It was designed as a high performance upgrade replacement for the Jensen JE990, Automated Processes Inc. API-2520, John Hardy Co. 990A-990C, FiveFish Studios DOA series, Seventh Circle Audio SC10, SC25, SC99, and Avedis Audio 1122 op-amp gain block. The pinouts conform to the 990 package, allowing direct replacement.

If the user is upgrading or replacing vintage or retro-clone gear, take note of the pin length required for your particular application. Older gear typically used modules with 0.480 to 0.510 inch long 0.040 pins.

See table 1. below for additional discrete opamps which can be upgraded.

The all-discrete SMT design is similar to the JE990 basic topology but has been completely redesigned to use an ultra-precision differential super-matched transistor pair specifically designed to meet the requirements of ultra-low noise, ultra-low THD, highly linear uncolored audio systems. In addition to the enhanced input stage, the 990Enh-Ticha uses high precision temperature stable power supply independent current sources. Supply independent current sources allow the bias to remain locked at the optimum operating point regardless of power supply voltage.

Dual matched pair temperature stable current mirrors, dual matched pair active current loads give the Model 990Enh it’s outstanding power supply rejection performance. The enhanced low distortion Class-A output driver stage can sink or source 250mA allowing this module to drive transformers easily.

Integrated power transistor heatsinks coupled to a anodized aluminum enclosure keeps the 990Enh-Ticha operating within a wide SOA and does not suffer from Beta droop when driving heavy iron or heavy loads. Each amplifier is fully tested and meets or exceeds published specifications.

Because of the 990Enh high current drive capability, supporting circuitry impedances can be scaled down within the application circuit. This can reduce the overall system noise, without increased distortion and provides higher headroom compliance performance.

Also we can provide a variation of this model that can operate down to ±4.5V for low power low voltage applications. Contact us and ask about the Model 990LV-Enh-Ticha.Features:

• Ultra Low Total Harmonic Distortion, 0.00045 THD+N @1kHz
• Ultra Low Noise 0.89nV/rtHz
• High Current Output Drive (250mA into 75 ohms)
• +26dBu Output Levels (into 600 ohms)
• Standard Gain Block Footprint
• 120dB Open Loop Gain
• Operates over ±9V to ±24V supply rails
• Lower output offset voltage than existing counterparts
• Lower input leakage current than existing counterparts
• Particular emphasis on audio performance
• Designed, assembled and produced in the USA
• 3 Year Warranty

Applications:

• Low Impedance Line Amplifiers • Active Filters and Equalizers • Summing/Mixer Amplifiers • High Performance Microphone Preamplifiers • High Performance A/D and D/A front end Preamplifier

Table 1. Compatible Upgrade Table The Model 990Enh-Ticha can be used to upgrade and/or replace these obsolete or end of life discrete operational amplifiers. This list is by no means comprehensive. Contact for additional information.

Jensen JE990 Series Automated Processes Inc. API-2520, 2520H, 2525 John Hardy Co. 990A-990C FiveFish Studios DOA series Avedis Audio 1122 Seventh Circle Audio SC10, SC25, SC99 Sound Skulptor SK25, SK99, SK47 Yamaha NE80100, NE80200 TOA PC2011 ProTech Audio Model 1000 Purple Audio KDJ3, KDJ4 Modular Devices 1731, 1757 Modular Audio Products (MAP) 5000 Series, 1731 1731A Melcor 1731 JLM Audio 99V Inward Connections SPA690 BTI OA400 FAX Audio FA-100 Analog Devices 111