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DESCRIPTION: Model 990RETRO Discrete Operational Amplifier. This listing is for quantity of one unit. If you need more than one, we can provide a quantity discount. The 990RETRO plastic housing is 1.125" x 1.125" square and 0.75" tall. The Model 990RETRO is a high performance discrete operational amplifier designed for professional audio application areas where ultra-low noise, low distortion and highly linear operation is required. The all-discrete design is similar to the Sonic Imagery Labs 990Enh-Ticha basic topology but the input differential super-matched transistor pair has been replaced with a NOS LM394. Like the modern 990Enh-Ticha, the 990RETRO uses 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 990RETRO 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 high grade thermal epoxy and plastic enclosure keeps the 990RETO 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. Specifications and Datasheets at: sonicimagerylabs.com 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 990RETRO 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 supply voltage. Dual matched pair temperature stable current mirrors, dual matched pair active current loads give the Model 990RETRO 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 themal epoxy keeps the 990RETRO 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 990RETRO's 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. See Also Sonic Imagery Labs Model 992Enh-Ticha- Discrete Op Amp DIP8 Sonic Imagery Labs Model 994Enh-Ticha- Dual Discrete Op Amp DIP8 Sonic Imagery Labs Model 995FET-Ticha- FET Discrete Op Amp 990/2520 Sonic Imagery Labs Model 990Enh-Ticha- Discrete Op Amp 990/2520 Sonic Imagery Labs Model 312A VCA Module -Voltage Controlled Amplifier Sonic Imagery Labs Model 898B 16 Channel Level Translator -Balanced - Unbalanced Cable Driver Contact us directly for OEM and quantity pricing. Features: • Ultra Low Total Harmonic Distortion, 0.00035 THD+N @ 1kHz • Ultra Low Noise 0.99nV/rtHz • High Current Output Drive 250mA peak • +26dBu Output Levels (into 600 ohms) • Standard Gain Block Footprint • 120dB Open Loop Gain • Operates over ±7.5V to ±26V 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 and Drivers • Active Filters and Equalizers • Summing/Mixer Amplifiers • High Performance Microphone Preamplifiers • High Performance A/D and D/A front end Preamplifier • High Performance D/A I-V converters • High Current Buffer Amplifier DOMESTIC SHIPPING AND HANDLING: Shipping and handling charges: Items can be shipped First Class Parcel for $5.85 with tracking or USPS Flat Rate Priority Mail for $10.20 with tracking. INTERNATIONAL SHIPPING AND HANDLING: USPS First Class International Parcel ---> for $19.70 USPS International Flat Rate Priority Mail ---> for $44.80 CANADA and MEXICO ships USPS International Flat Rate Priority Mail $30.35, customs tracking to the border. All other countries- Contact us directly if you would rather use your own FEDEX, DHL or UPS carrier account. CONDITIONS OF SALE: Please read our terms carefully. Failure to understand our terms and conditions will delay your shipment of your items. All items are sold with a 14 day satisfaction, money back, guarantee. Payment is due within 10 business days of auction's end. PAYMENT INFO: We accept Visa, Mastercard, American Express and Discover thru the eBay payment system. Payments from outside the US should be payable in US Dollars. Table 1. Compatible Upgrade Table The Model 990RETRO 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 Sonic Imagery Labs for additional information. Jensen JE990 Series John Hardy Co. 990A-990C+ FiveFish Studios DOA series Avedis Audio 1122 Seventh Circle Audio SC99 Sound Skulptor 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