Tech Lowdown

the Tech
iPhono3 Black Label
In iPhono3 Black Label the unique ‘DC-infinity’ circuit boosts the circuits DC gain to
approach infinity (it is approximately 1 trillion one million times one million; 10
12
).
Once the feedback loop is closed, this near infinite DC gain cancels all offset
voltages to deliver a direct-coupled output with 0V DC offset. The key to the ‘DC-
Infinity’ circuit is that it only changes the gain below approx. 0.01Hz, while leaving
the AC behaviour of the circuit at higher frequencies unchanged, injecting neither
noise nor distortion into the audio signal.
Any noise and distortion of the DC-Infinity circuit happens at the
same signal level as the output signal and is by design, 100
times less than the noise and distortion of the actual amplifier
circuit. Noise and distortion it effectively disappears.
Class A TubeState® Circuit
At AMR/iFi we have always loved the sound of tubes and have produced tube
equipment under the AMR brand name in the ultra-high end arena. However,
tubes run hot, take up a fair bit of space and cost a pretty penny. Solid-state can be
designed as a small and affordable circuit, as well as running cool.
Wouldn't it be great if we could get ‘tube sound’ from solid-state gear? Okay,
maybe not an exact replica of real tubes but as close as it can possibly get. Now
most people would tell you that "Tube sound with solid state - that's just
impossible". But it is possible and it really is worth it.
The TubeState® technology is the result of nearly four decades of research by our
Chief Designer Thorsten Loesch on tube and transistor gear. He started his audio