The Ram tube is a short plate construction which is very low in micro phonics. If you've had problems with micro phonics this is the tube to try.
The 12AX7LPS Russian is the closest to the large plate European construction. This Russian 12AX7 works well in a traditional circuit.
Our Super Low Noise tubes are quite simply the industry’s quietest tubes, suitable for the finest phono stages as well as any other critical application. Only 10% of the tubes we test perform well enough to be considered Super Low Noise.