PAIR TWO Sonic Imagery Discrete OpAmp

Compatible with the VTV Amplifier Custom input buffer (tube or solid state) using two per channel, but may be used in other amplifiers as well. These are an excellent upgrade from IC based opamp designs.

General Description

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 multiple vintage op-amp designs, with pinouts conforming to the 990 package, allowing direct replacement.

Design Characteristics

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.

It features dual matched pair temperature stable current mirrors and an enhanced low distortion Class-A output driver stage that can sink or source 250mA, allowing easy driving of transformers.

Key Highlights

The integrated power transistor heatsinks coupled with an anodized aluminum enclosure keep the 990Enh-Ticha operating within a wide SOA and prevent Beta droop when driving heavy loads.

Its high current drive capability allows supporting circuitry impedances to be scaled down, potentially reducing overall system noise without increased distortion and providing higher headroom compliance performance.