In the iPhono2, the Class A TubeState® has been further refined. There is an all-new Burr-Brown Soundplus® J-FET type amplifier at the heart of the new Class A, J-FET/BJT output buffer.
This new circuit significantly reduces the loading seen by the main amplification circuit; which improves the circuit inherent linearity while allowing it to drive even punishing 600 ohm studio inputs with impunity.
The power supply filtering has been increased 5X in value. The iPhono2 noise performance was further optimised to achieve a noise levels that approach what is feasible at room temperature. To achieve lower noise, cooling the circuit in liquid nitrogen would be needed.
Drawing from admired AMR PH-77, the super-silent noise floor of the iPHONO2 is quite remarkable. It defies its price class to challenge money-no-object phono stages.
The litmus test of any good phono stage design is that it is able to amplify the signal but not the noise. Hence, we advise customers to take the iPHONO2 home and to not listen to it. Why? They should lower the cartridge and turn the listening level as loud as possible. Then lift the needle again……and listen for the lack of noise that just about every phono stage is affected with.
The iPHONO2 with a Signal-to-Noise ratio of 85dB is 3dB quieter than the original iPHONO.
More than ever, listening to vinyl, one can hear ‘into’ the recording itself with the blackest of backgrounds and every nuance, inflection is picked up by the system.