Emission Labs AD1 Mesh/AD1-UX4 Mesh RørThe EML AD1 mesh is a 15 Watt single Anode directly heater triode, electrically similar to 2A3, but AD1 works at 4Volt heaters. Though it is electrically not identical, any existing 2A3 circuit diagram can be used, provided you have the 4 Volt heater voltage available. We have a version with the vintage 8pin Side socket, and with the 4Pin UX4 base. AD1, the queen of European DHT triodes, is an autio tube, intended for large radios and cinema