I promised to come back in detail what we have done to make a PrimaLuna DiaLogue Premium Integrated Amplifier out of the very well-known PrimaLuna DiaLogue Two.
Let me start with the last thing we added : the Offset Killer Circuit. The full circuit is built on a dedicate pc board positioned at the AC entrée for maximum effect.
The filter was designed by us many years ago to eliminate mains pollution, especially DC components coming from the mains. A small amount of DC on the mains, occurs a lot of hum in Toroidal transformers of High End Audio equipment. Specially in case of power amplifiers which use larger toroid transformers. The bigger the amp (and the transformer) the worse the hum might become.
(PS For your information and better understanding: The first time we used this filter was when we were dealing with a very annoying humming integrated amplifier. We also offered the board to be built in other products suffering from humming toroid transformers. Most recently we built a higher powered version of this circuit to make some top-of-the-bill humming mono amplifiers dead silent and best sounding).
Why add it to a product that is already known to be dead silent in every possible way? Just because we know AC is getting more polluted every day. So what we do now, might benefit you in the future: our desire to give you a “best level possible” sound quality, reliability, value. Now and in the years to come.
The DC Killer is designed around twelve fast switching diodes with soft recovery time, like the STTH8L06FP. This diode can handle 10Amps, with a recovery time of 105ns! They are also hermetically sealed in a plastic TO220FP case. Next to that the diodes are filtered with good quality capacitors. The full circuit is built on a dedicate pc board positioned at the AC entrée for maximum effect.
Next time I will highlight and describe another part of the design of the PrimaLuna DiaLogue Premium Integrated Amplifier.