Emission Labs AD1 Mesh (Pair)

Matched pairs are special order directly from Emission Labs.  Typical delivery is within 4-8 weeks.   You must select whether you are looking for a standard or UX4 type base for this tube.   The EML AD1-mesh is a 15 Watt single Anode directly heated triode, electrically similar to 2A3, but AD1 works at 4Volt heaters and it has another base. Though it is electrically not identical, any existing 2A3 circuit diagram can be used, provided you have the 4 Volt heater voltage available. One important feature of the EML AD1-Mesh, is the possibility to operate it at higher voltage than the historical tubes. Some historical tubes allowed the use above 250Volts, but not all. At higher Anode voltage, the AD1 turns into a tube with amazingly high efficiency, outdoing 2A3. However at the higher Anode voltage, it requires a higher impedance transformer. AD1, the queen of European DHT triodes, was intended for large radios and cinema amplifiers. It was introduced just before the second world war, u