The OMA RIAA Phono Stage is ultra transparent, utilizing a proprietary circuit without input or output transformers, with 50db of gain. Suitable for moving magnet, moving iron and moving coil cartridges with the outboard OMA step up transformer (SUT).
Like all OMA products, it is hand built with a 1" thick solid Pennsylvania black walnut chassis, fashioned with hand made dovetailed joints and finished with hand rubbed oil and wax. The top plate is honed slate, and the chassis itself is built on very heavy gauge powder coated steel.
The OMA RIAA eq is extraordinarily accurate, and is DC coupled to the driver stage. The power supply is housed in a separate compartment of the chassis to isolate the signal chain. The circuit is dual wide band, high gain and low z output. It will easily drive almost any amplifier directly, including all OMA power amplifiers. A selector switch allows the user to choose between four inputs.
Tube compliment for the OMA RIAA is one 6X5GT rectifier, two 5755 and two 5965. These are superior tubes in the proper circuit and allow the user a wide choice, in the case of the 5965, of tube brands for experimentation