WTB: Black Gate NX-Hi-Q 6.3V/47uf

Much to our surprise we found a new type that not only is built partly the same way a Black Gate cap is, but also has better technical and sonic qualities. This series like Black gate caps has an isolator that is chemically bonded to the conductor plate, and a solid conductive compound to hold the plates together in a close proximity to give a high capacitance. In a black Gate capacitor the isolator was alumina dioxide, also known as a common anodization. The SAL-RPM from Vishay has the exact same isolator. In the black Gate's the plates are connected with a paper impregnated with conductive graphite, to give a close connection. However this power has been known to fall out of the paper when high temperatures start to dry out the liquid the paper was originally soaked in. That is why as you may have seen various places that the Black Gate caps do not have a very long lifespan. In the SAL-RPM caps however a conductive compound is potted between the isolated plates, and this will not fall out, or dry up. The lifespan of a SAL cap is an impressive 30.000 Hours at load. And with a maximum temperature of 175 degrees C, it shows we are dealing with a radically different type of capacitor. And electrolytic cap would dry out in hours at this high temperature! What makes the SAL caps sound better is the fact that the plates are held in place with a solid potting compound that prevents any kind of micro-vibration when currents run through the capacitor.