This Module is currently available.
Classic clean preamp circuit
The Twin-Servo is a high performance microphone preamp that leverages two discrete 990 op-amps for incredibly clean and transparent operation.
https://www.radialeng.com/product/twin-servo
These merchants probably sell this module. Huh?
Included in 8 Racks, 3 are public:
Radial Jensen Twin-Servo 500 Series
Radial Twin Servo 500 Series Microphone