Egy év garancia vagy 2000 óra.
The EML 300B Mesh is a wonderful and most amazing tube. The use of this tube requires some care, because it is no plug & play replacement for any 300B. However excellent sound quality is possible with this tube.
When you have a "muscle" type of 300B amplifier, claiming to get so and so many Watt out of a standard 300B tube, sometimes you are dissatisfied with the sound, being somewhat dominant, and you don't experience the triode sound you have been looking for. Getting best triode sound out of a 300B doesn't mean to choose the highest possible operating point, and get an amplifier on steroids. Loudness should not be produced by inefficient speakers which have to be "kicked" with high amounts of energy. Without going into the details of this, it feels already obvious that the much sought, swee, silky triode sound, can not be achieved, by an amplifier firing the 300B close to the breakdown point.
The finest and sweetest sound has always been produced by the smaller size tubes. To get enough loudness, use speakers chassis with strongest magnets, and you need just a few Watt. In this light the 300B-mesh has to be seen. It is a tube for listeners that can do with a fraction less loudness, but for that seek more triode-like sound, with the magic and transparency of the mesh plate tubes.